For everyday washing, I’d choose CeraVe Gentle Hydrating Shampoo as the best overall pick for its mild, moisturizing focus on hair and scalp. CleanLife No-Rinse Shampoo suits days when rinsing is difficult, while OUAI Fine Hair Shampoo is a better fit for people seeking a fuller look in fine strands. The main tradeoff is whether to prioritize gentle cleansing, more volume, odor control, or a wash without water. These products serve different needs, so the best choice depends on comfort, mobility, hair texture, and scalp sensitivity. Read on for how each option compares and which buyer it suits.
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Key Takeaways
- CeraVe is the most balanced everyday choice in this lineup, while the no-rinse options are more useful when a conventional wash is impractical.
- CleanLife liquid and Nurture shampoo caps solve different washing problems: one is a foaming rinse-free formula, while the other is a pre-moistened cap format.
- OUAI and OGX focus on fuller-looking hair, but volume-oriented formulas may not be the first choice for a dry or easily irritated scalp.
- PURA D’OR bundles shampoo and conditioner for a thinning-hair routine, but its anti-thinning positioning should not be treated as proof that it regrows hair.
- Mirai Clinical targets odor concerns, making it a more specialized choice than a general-purpose shampoo.
| No-Rinse CleanLife Products Shampoo, 8 fl oz – Waterless, Rinse-Free, Quick Foaming Liquid Formula for Surgery Recovery, Elderly Care & Camping |  | Best for Bedside Washing | Volume: 8 fl oz | Form: Liquid, foam | Rinsing: Waterless, rinse-free | VIEW ON AMAZON | See Our Full Breakdown |
| OUAI Fine Hair Shampoo – Biotin Thickening Shampoo for Thin Hair (10 Fl Oz) |  | Best for Fine, Flattened Hair | Size: 10 fl oz | Type: Thickening shampoo | Key ingredients: Biotin, hydrolyzed keratin, chia seed oil | VIEW ON AMAZON | See Our Full Breakdown |
| OGX Thick & Full Biotin & Collagen Volumizing Shampoo, 13 fl. oz |  | Best for Longer-Lasting Body | Volume: 13 fl oz | Key ingredients: Biotin, collagen, bamboo fiber extract, hydrolyzed wheat protein | Formulation: Sulfate-free | VIEW ON AMAZON | See Our Full Breakdown |
| CeraVe Gentle Hydrating Shampoo with Hyaluronic Acid for Hair & Scalp, 12oz |  | Best for Sensitive, Dry Scalps | Size: 12 oz | Key ingredients: Ceramides, niacinamide, hyaluronic acid | Formulation: Sulfate-free, paraben-free, fragrance-free | VIEW ON AMAZON | See Our Full Breakdown |
| Nurture No Water Rinse-Free Shampoo Cap 6 Pack |  | Best Ready-to-Use Shampoo Cap | Pack size: 6 caps | Type: Rinse-free shampoo cap | Application: Waterless | VIEW ON AMAZON | See Our Full Breakdown |
| PURA D’OR Gold Label Anti-Thinning Biotin Shampoo & Conditioner, 16oz x2 |  | Best for Thinning Hair | Set size: 16 oz x 2 | Product type: Shampoo and conditioner | Formulation: Sulfate-free | VIEW ON AMAZON | See Our Full Breakdown |
| Mirai Clinical Persimmon Shampoo for Old People Smell, Nonenal® Solution |  | Best for Mature Scalp Odor | Suitable for: Mature and color-treated hair | Key ingredients: Japanese persimmon, camellia oil, and silk protein | Free from: Sulfates, parabens, synthetic fragrances, and artificial colors | VIEW ON AMAZON | See Our Full Breakdown |
| shampoo for elderly hair | Key ingredients |
|---|---|
| No-Rinse CleanLife Products Sh | — |
| OUAI Fine Hair Shampoo | Biotin, hydrolyzed keratin, chia seed oil |
| OGX Thick & Full Biotin & Coll | Biotin, collagen, bamboo fiber extract, hydrolyzed wheat protein |
| CeraVe Gentle Hydrating Shampo | Ceramides, niacinamide, hyaluronic acid |
| Nurture No Water Rinse-Free Sh | — |
| PURA D’OR Gold Label Anti-Thin | Biotin, aloe vera, argan oil, nettle, pumpkin seed, and Red Korean Seaweed |
| Mirai Clinical Persimmon Shamp | Japanese persimmon, camellia oil, and silk protein |
More Details on Our Top Picks
No-Rinse CleanLife Products Shampoo, 8 fl oz – Waterless, Rinse-Free, Quick Foaming Liquid Formula for Surgery Recovery, Elderly Care & Camping
For someone who cannot comfortably get to a sink or shower, waterless cleansing matters more than extra volume or shine. This quick-foaming liquid cleans hair without a rinse, making it a practical choice for caregivers supporting an older adult during recovery or limited mobility. Its pH-balanced, paraben-free formula is a gentler-sounding alternative to a conventional wash, though the product still calls for towel drying after application. Compared with the Nurture No Water Rinse-Free Shampoo Cap, CleanLife comes in a bottle rather than a ready-to-wear cap, which may suit targeted application but can take more hands-on effort. I would choose it for occasional bedside washing, not as a full replacement for regular shampoo: the listing notes that it may not meet the needs of routine use.
Pros:- Cleans without access to running water or a rinse
- Quick-foaming liquid allows application where needed
- pH-balanced and paraben-free formula
- Designed for caregiving, recovery, and travel situations
Cons:- Requires towel drying after application
- May not replace traditional shampoo for regular washing
- Applying liquid may take more effort than using a shampoo cap
Best for: Caregivers washing the hair of an older adult who is temporarily bedridden, recovering from surgery, or unable to use a shower easily
Not ideal for: People who want a regular daily shampoo routine or a no-mess, ready-to-use cap; this liquid needs application and towel drying
- Volume:8 fl oz
- Form:Liquid, foam
- Rinsing:Waterless, rinse-free
- Foaming:Quick foaming
- Formula:pH-balanced
- Free from:Parabens
- Made in:USA
Our verdict“Choose CleanLife for occasional bedside hair washing when rinsing is impractical, but not as your main everyday shampoo.”
OUAI Fine Hair Shampoo – Biotin Thickening Shampoo for Thin Hair (10 Fl Oz)
When aging hair feels finer or loses lift, OUAI is the most directly volume-focused choice in this group. Its biotin and hydrolyzed keratin target a fuller-looking result, while chia seed oil adds shine; the sulfate-free formula is also described as suitable for color-treated and chemically processed hair. Compared with OGX Thick & Full Biotin & Collagen Volumizing Shampoo, OUAI is specifically aimed at fine hair rather than offering a broader thickening pitch. That focus makes it a better fit for strands that collapse easily, but not a universal pick: the description cautions that it may not add volume to very coarse or thick hair. I would also factor in the need for conditioner and styling products to get the best results, along with the Mercer Street scent, which may not suit fragrance-sensitive buyers.
Pros:- Formulated specifically for fine, thin hair
- Biotin and hydrolyzed keratin support a fuller-looking finish
- Sulfate-free and described as suitable for color-treated hair
- Chia seed oil adds shine
Cons:- May not add volume to very coarse or thick hair
- Best results may depend on conditioner and styling products
- Mercer Street scent may not suit fragrance-sensitive users
Best for: Older adults with fine, thin hair who want a shampoo aimed at visible lift and whose hair is color-treated or chemically processed
Not ideal for: People with very coarse or thick hair, or those seeking a fragrance-free routine or a shampoo-only volume solution
- Size:10 fl oz
- Type:Thickening shampoo
- Key ingredients:Biotin, hydrolyzed keratin, chia seed oil
- Free from:Sulfates, parabens, phthalates, gluten
- Hair types:Fine, thin hair
- Color-treated hair:Described as suitable
- Scent:Mercer Street
Our verdict“Pick OUAI if fine, aging hair needs lift and you are comfortable building a routine around the shampoo.”
OGX Thick & Full Biotin & Collagen Volumizing Shampoo, 13 fl. oz
OGX makes sense for older adults who want a fuller look that lasts beyond wash day: its formula is described as providing 72+ hours of body and protection against frizz and breakage. Biotin and collagen are joined by bamboo fiber extract and hydrolyzed wheat protein, giving this pick a broader ingredient blend than OUAI Fine Hair Shampoo, which is more specifically directed at fine strands. OGX is also listed as sulfate-free and suitable for colored or treated hair. The tradeoff is scalp tolerance: the product data warns it may not suit sensitive scalps, so I would put CeraVe Gentle Hydrating Shampoo ahead of it for anyone prioritizing a fragrance-free, sensitive-scalp formula. OGX also calls for regular use to support its intended results, so it is less compelling for occasional washing.
Pros:- Designed to provide 72+ hours of body
- Contains biotin, collagen, bamboo fiber extract, and hydrolyzed wheat protein
- Sulfate-free and described as suitable for colored and treated hair
- Formula is listed as free from parabens, phthalates, microplastics, and dyes
Cons:- May not suit sensitive scalps
- Regular use is suggested for best results
- Fewer fragrance options may be limiting for scent-sensitive buyers
Best for: Older adults seeking lasting body for flat or thinning-looking hair and who do not have a notably sensitive scalp
Not ideal for: People with easily irritated or sensitive scalps, or those who want a fragrance-free shampoo option
- Volume:13 fl oz
- Key ingredients:Biotin, collagen, bamboo fiber extract, hydrolyzed wheat protein
- Formulation:Sulfate-free
- Also free from:Parabens, phthalates, microplastics, dyes
- Protection technology:LipiPro Shield
- Stated body duration:72+ hours
- Color-treated hair:Described as suitable
Our verdict“Choose OGX for a longer-lasting body-focused wash if your scalp tolerates it; choose CeraVe instead when gentleness is the priority.”
CeraVe Gentle Hydrating Shampoo with Hyaluronic Acid for Hair & Scalp, 12oz
For older adults whose main complaint is a dry or easily irritated scalp, CeraVe puts comfort ahead of dramatic volume. Its fragrance-free, sulfate-free formula pairs ceramides, niacinamide, and hyaluronic acid with a pH-balanced design, and it is described as suitable for sensitive scalps and color-treated hair. That makes it a different kind of choice from OGX Thick & Full Biotin & Collagen Volumizing Shampoo, which emphasizes extended body but carries a warning about sensitivity. CeraVe’s tradeoff is a less foamy wash and the likelihood of needing conditioner for the feel you want. It is also not the pick for someone whose primary goal is a visibly thicker style; OUAI Fine Hair Shampoo is more directly aimed at lift. I would favor CeraVe when scalp comfort and moisture take precedence.
Pros:- Fragrance-free and formulated for sensitive scalps
- Ceramides, niacinamide, and hyaluronic acid support a moisture-focused routine
- Sulfate-free and pH-balanced
- Described as suitable for all hair types and color-treated hair
Cons:- May produce less lather than traditional shampoos
- May work best when paired with conditioner
- Does not target volume as directly as OUAI or OGX
Best for: Older adults with a dry, sensitive, or fragrance-reactive scalp who want a gentle wash and have color-treated hair
Not ideal for: Buyers focused on maximum volume or a rich lather, or anyone who wants a shampoo that can stand alone without conditioner
- Size:12 oz
- Key ingredients:Ceramides, niacinamide, hyaluronic acid
- Formulation:Sulfate-free, paraben-free, fragrance-free
- Also free from:Dyes
- Suitable for:All hair types, including color-treated hair
- Scalp suitability:Sensitive scalps
- pH balance:Yes
- Development:Developed with dermatologists
Our verdict“Choose CeraVe when a gentle, fragrance-free wash matters more than lather or added volume.”
Nurture No Water Rinse-Free Shampoo Cap 6 Pack
Nurture is the easiest format here for a caregiver who wants to avoid pouring, lathering, and rinsing: the disposable cap combines shampoo and conditioner in a universal-fit design. It is intended to cleanse and hydrate without water, making it a practical option for travel, camping, or care situations where a sink is out of reach. Compared with CleanLife No-Rinse Shampoo, the cap offers a more contained application and includes conditioning, while CleanLife’s bottle may allow more targeted use. The tradeoffs are practical rather than cosmetic: each cap is single-use, and the listed fit may feel less secure for some people. It is also not positioned as a replacement for routine washing. I would choose Nurture for convenience on wash days that cannot happen at a sink, not for everyday hair care.
Pros:- Combines shampoo and conditioner in one ready-to-use cap
- Cleanses without water or a rinse
- Disposable format can reduce setup and cleanup
- pH-balanced formula is described as hydrating and shine-restoring
Cons:- Single-use caps create waste
- May not replace traditional shampoo for daily use
- Universal fit may feel less secure for some users
Best for: Caregivers and older adults who need a contained, water-free wash during travel, outdoor activities, or limited-mobility care
Not ideal for: People who need a regular daily shampoo, want to avoid disposable products, or may find a universal-fit cap insecure
- Pack size:6 caps
- Type:Rinse-free shampoo cap
- Application:Waterless
- Design:Disposable, universal fit
- Formula:pH-balanced
- Functions:Cleanses and conditions
- Stated benefits:Hydrates hair and adds shine
- Suggested settings:Travel, camping, outdoor activities
Our verdict“Choose Nurture for a convenient, contained water-free wash, but use a regular shampoo for ongoing hair care.”
PURA D’OR Gold Label Anti-Thinning Biotin Shampoo & Conditioner, 16oz x2
For older adults whose main concern is fine or thinning hair, this paired shampoo and conditioner focuses on reducing breakage and supporting a fuller-looking result. Biotin, aloe vera, argan oil, nettle, pumpkin seed, and Red Korean Seaweed give the formula a broader botanical blend than OUAI Fine Hair Shampoo, while the included conditioner makes it a more complete routine for hair that feels dry or fragile. The sulfate-free formula is also suited to color-treated hair. The tradeoff is patience: this is not an immediate fix for visible thinning, and the product calls for consistent use. Unlike CeraVe Gentle Hydrating Shampoo, which centers on gentle scalp care, PURA D’OR is aimed more directly at the appearance and resilience of thinning strands.
Pros:- Shampoo and conditioner are supplied together for a coordinated routine.
- Sulfate-free formula is suitable for color-treated hair.
- Botanical ingredients include biotin, aloe vera, and argan oil.
- Designed to help reduce breakage and support fuller-looking hair.
Cons:- Visible results may take consistent use and are not immediate.
- Some buyers may find the scent too subtle.
- The set may be unnecessary for shoppers who only need shampoo.
Best for: Older adults with fine, fragile, or thinning hair who want a coordinated shampoo-and-conditioner routine and are willing to use it consistently.
Not ideal for: Anyone seeking an immediate change in hair density, a single shampoo-only product, or a strongly scented formula.
- Set size:16 oz x 2
- Product type:Shampoo and conditioner
- Formulation:Sulfate-free
- Key ingredients:Biotin, aloe vera, argan oil, nettle, pumpkin seed, and Red Korean Seaweed
- Hair concerns:Fine, thinning, or fragile hair
- Color-treated hair:Suitable
- Made in:USA
Our verdict“Choose PURA D’OR if thinning and breakage matter more to you than quick results or a shampoo-only routine.”
Mirai Clinical Persimmon Shampoo for Old People Smell, Nonenal® Solution
When unwanted mature-scalp odor is the priority, Mirai Clinical has a more specific purpose than the other options in this roundup. Its Japanese persimmon formula is designed to address odor associated with Nonenal, while camellia oil and silk protein offer a gentler, more conditioning direction for mature or color-treated hair. It is fragrance-free and excludes sulfates, parabens, and artificial colors, making it a fit for people who avoid added scent or have sensitive scalps. Compared with PURA D’OR Gold Label, this is not primarily a thinning-hair choice; PURA D’OR offers a shampoo-and-conditioner set and targets breakage. Mirai’s narrow focus is also its limitation: it may not address other scalp concerns, and fragrance-free means it will not leave a perfumed scent.
Pros:- Formulated specifically to address odor associated with Nonenal.
- Fragrance-free and free from sulfates, parabens, and artificial colors.
- Camellia oil and silk protein support a softer-feeling hair finish.
- Suitable for mature and color-treated hair and described for daily use or as a clarifying booster.
Cons:- Its primary focus is odor rather than thinning, volume, or other scalp concerns.
- Fragrance-free formula will not provide a perfumed scent.
- The description does not specify bottle size.
Best for: Older adults bothered by scalp odor who want a fragrance-free shampoo that can also be used on color-treated hair or a sensitive scalp.
Not ideal for: Buyers focused mainly on thinning or volume, or anyone who wants a noticeable fragrance to mask odor.
- Suitable for:Mature and color-treated hair
- Key ingredients:Japanese persimmon, camellia oil, and silk protein
- Free from:Sulfates, parabens, synthetic fragrances, and artificial colors
- Fragrance:Fragrance-free
- Primary purpose:Addressing odor associated with Nonenal
- Suggested use:Daily use or as a clarifying booster
Our verdict“Pick Mirai Clinical when mature-scalp odor is your main concern and a fragrance-free formula matters more than volume support.”
How We Picked
I ranked these products by how well their stated format and focus match common needs associated with aging hair and hair care: a comfortable wash, manageable dry or fine strands, reduced reliance on rinsing, or attention to a specific concern. I gave more weight to clear everyday usefulness and ease of choosing than to narrow claims. Since hair and scalp needs vary widely, I also considered whether a product’s role is specific enough for a reader to tell when it fits—and when another option would make more sense.
The ranking reflects tradeoffs, not a claim that one shampoo suits every older adult. CeraVe leads as the broadest conventional option; CleanLife and Nurture follow for separate no-water situations; the remaining products are placed according to their more focused volume, thinning-care, or odor-control aims. I treated anti-thinning and odor-related positioning as product purposes rather than guaranteed outcomes, and weighed format, routine fit, and the risk of choosing a specialized formula when a simpler wash may be enough.
| shampoo for elderly hair | Key ingredients |
|---|---|
| No-Rinse CleanLife Products Sh | — |
| OUAI Fine Hair Shampoo | Biotin, hydrolyzed keratin, chia seed oil |
| OGX Thick & Full Biotin & Coll | Biotin, collagen, bamboo fiber extract, hydrolyzed wheat protein |
| CeraVe Gentle Hydrating Shampo | Ceramides, niacinamide, hyaluronic acid |
| Nurture No Water Rinse-Free Sh | — |
| PURA D’OR Gold Label Anti-Thin | Biotin, aloe vera, argan oil, nettle, pumpkin seed, and Red Korean Seaweed |
| Mirai Clinical Persimmon Shamp | Japanese persimmon, camellia oil, and silk protein |
Factors to Consider When Choosing Shampoo For Elderly Hair
Choosing shampoo for older hair is less about age-specific labeling and more about matching the wash to the person’s scalp, hair texture, and bathing routine. I’d start with the practical problem the shampoo needs to solve, then check whether the formula and format fit regular use.
Start With the Scalp, Not the Age on the Label
Dryness, sensitivity, oiliness, and flaking can matter more than age itself. A shampoo marketed for volume or thinning may not be the best match if the scalp feels tight or irritated after washing. Look at the intended cleansing strength and any fragrance or active ingredients that have caused problems before. If irritation is persistent, a new shampoo may not address the cause, so a clinician can help distinguish product sensitivity from a scalp condition. When changing products, make one change at a time so it is easier to spot what helps or aggravates the scalp.
Decide Whether Rinsing Is Practical
For someone who can comfortably shower or wash at a sink, a conventional shampoo usually offers a familiar routine and clear rinsing. When mobility, recovery, or caregiver access makes rinsing difficult, a rinse-free liquid or shampoo cap may reduce the effort involved. These formats are not identical: the liquid requires application and handling, while a cap is a contained, pre-moistened option. Check the directions and assess whether the person can tolerate the process and any residue or fragrance. A no-water wash can help between full washes, but it may not replace regular rinsing for every scalp or hair type.
Match Volume Claims to Hair Texture
Fine or limp hair may benefit from a formula designed to make strands look fuller, but volume is a styling effect rather than a fix for the cause of hair loss. Rich conditioning ingredients can weigh down some fine hair, while a strongly cleansing routine can leave dry lengths feeling rough. Consider how much body the person wants and whether they are willing to use a separate conditioner on the ends. If hair is thinning at the scalp, avoid assuming a shampoo alone can restore density. For sudden or marked hair loss, medical advice is more useful than switching among volume products.
Treat Thinning and Hair Loss Claims Carefully
Products described as anti-thinning may be intended to support a hair-care routine, but shampoo is rinsed off and should not be treated as a proven solution for every kind of hair loss. Check whether a set includes conditioner and whether both products fit the person’s washing frequency and scalp comfort. Avoid buying a larger routine before confirming that the formula suits the user. Hair loss can have many causes, including health changes and medication effects, so a clinician can help identify when a shampoo choice is not enough. Choose based on comfort and routine first, rather than expecting a cosmetic product to reverse thinning.
Separate Odor Control From General Cleansing
A shampoo aimed at a particular odor concern is a specialized purchase, not automatically the best daily shampoo for everyone. First consider whether the odor comes from the scalp, hair, clothing, bedding, or another source, since washing the hair may not address the underlying issue. A targeted product can make sense when that concern is clear, but its focus may be unnecessary for buyers seeking simple hydration or volume. Check how the instructions fit the user’s routine and whether the scent or formula is comfortable. If an odor persists despite regular hygiene, consider other causes rather than repeatedly changing shampoos.
Think About Handling, Help, and Wash Frequency
Packaging and application can matter as much as the ingredient list when hand strength, reach, or caregiver time is limited. A cap format may be easier to manage than pouring and spreading a liquid, while a standard bottle may suit someone who already washes independently. Also decide whether the product is for every wash or occasional use between full washes. Frequent cleansing can feel drying for some people, while too little washing may leave buildup or discomfort. Pick a routine the user can sustain, and ask for help with application if balance or movement makes washing unsafe.
Frequently Asked Questions
Is a rinse-free shampoo cap better than a no-rinse liquid shampoo?
Neither format is automatically better; the right choice depends on who is doing the wash and what they can comfortably handle. A cap keeps the product in a ready-to-use format, while a liquid gives the caregiver or user more control over where and how much to apply. Consider hand mobility, the person’s tolerance for wearing a cap, and how much cleanup is manageable. Follow each product’s directions and check whether the hair or scalp feels comfortable afterward. For routine hygiene, confirm whether occasional no-water washes meet the person’s needs or whether a full rinse is still needed.
Can a thickening shampoo reverse age-related hair loss?
A thickening shampoo may help hair look fuller, but that cosmetic effect is different from treating the cause of hair loss. The products in this roundup are not a substitute for finding out why shedding or thinning is happening. If the change is sudden, patchy, or accompanied by scalp symptoms, seek medical guidance instead of relying on shampoo claims. For gradual fine or limp hair, a volume-focused formula may still be useful for appearance. Choose it based on scalp comfort and how the hair feels after washing, not on an expectation of regrowth.
Should an older adult use a moisturizing shampoo every wash?
That depends on the person’s scalp, hair texture, and washing schedule; age alone does not dictate how often to use a moisturizing formula. If the scalp feels dry or the hair becomes brittle after washing, a gentler, hydrating option may be a reasonable starting point. Someone with fine hair may prefer a lighter wash if richer formulas leave strands flat. Try changing one part of the routine at a time and watch for itching, tightness, or residue. Persistent discomfort deserves medical advice rather than repeated product changes.
Is shampoo made for older adults necessary if regular shampoo feels comfortable?
No special age label is required when a person’s current shampoo cleans comfortably and leaves the scalp and hair in good condition. The useful question is whether a specific need has changed, such as difficulty rinsing, new dryness, fine hair that feels limp, or a particular odor concern. A product designed for that need may make the routine easier, but switching without a reason can add expense and irritation risk. If the existing formula works, there is little reason to replace it just because of age. Revisit the choice if comfort, mobility, or hair condition changes.
When should persistent scalp odor or irritation be checked by a clinician?
Seek medical advice if odor remains despite ordinary washing, or if it comes with pain, redness, sores, significant itching, or unusual scaling. A specialized odor-control shampoo may address a surface concern, but persistent symptoms can have causes that shampoo cannot resolve. Irritation that begins after a new product is a reason to stop using it and see whether symptoms settle. Avoid applying multiple new treatments at once, since that can make the cause harder to identify. A clinician can recommend the right next step based on the symptoms and health history.
Conclusion
For most buyers, CeraVe Gentle Hydrating Shampoo is my best overall pick because it offers the clearest general-purpose role in this group. For value-minded buyers seeking a complete routine, PURA D’OR’s shampoo-and-conditioner set is the bundle choice, though its anti-thinning positioning should not be read as a promise of regrowth. For beginners, I’d start with CeraVe if a regular rinse is manageable, or CleanLife if it is not. For premium-leaning volume care, OUAI Fine Hair Shampoo is the focused pick; OGX is another volume option to compare. Choose Nurture’s cap for a contained no-water wash, and Mirai Clinical only when odor control is the specific priority.
