hydrogen peroxide mouthwash
Skip itA concentrated shelf (top 5 take 100% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible21.5%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Quality gap
Great4.1★avg incumbent rating — lower means beatable quality
Market size
Great£1.1M£1.1M/yr · 603K searches
Avg price
Bad£8.77avg listing price — sweet spot $15–$100
Review moat
Bad19,425avg incumbent reviews — the moat a new listing must climb
Growth
Bad-18.6%90-day search growth — must beat 0% to launch
Competition
Bad100%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
Price range
Bad£3.84–£12.38cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, hydrogen peroxide mouthwash is a £1.1M/yr Amazon United Kingdom market (603K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 45/100.
Data updated Jul 24, 2026 · scored weekly · How we score niches
hydrogen peroxide mouthwash market data
- Units sold / yr
- 80K–100K
- avg 12,500–15,000/product
- Revenue / yr
- £702K–£877K
- units × avg price
- Conversion rate
- 21.5%
- Avg BSR
- #44
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 50%
- Out of stock
- 6.4%
- Avg brand age
- 40 months
- Avg seller age
- 150 days
Competition & brand share
The top 5 products capture 100% of clicks — a locked-up shelf that new listings rarely crack.Brands
2 falling
Sellers
14
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
100%
Top 20: 100%
Open market
0%
- HISMILE81%
- Colgate19%
Demand
Weekly Amazon search volume, last 46 weeks — -18.6% search growth over the last 90 days.Top hydrogen peroxide mouthwash search terms
- hismile170K/yr
- hismile mouthwash78K/yr
- hydrogen peroxide mouthwash59K/yr
- hi smile64K/yr
- peroxyl mouthwash60K/yr
- hi smile mouthwash29K/yr
- id stain whitening mouthwash31K/yr
- peroxide mouthwash12K/yr
- colgate peroxyl mouthwash24K/yr
- id mouthwash11K/yr
Top hydrogen peroxide mouthwash products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 4 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Hismile iD Stain Whitening Mouthwash Gunk Removing Mouthwash for Fresh Breath Hydrogen Peroxide Mouthwash to Promote Whiter Teeth Alcohol-Free Mouthwash with Essential Oils 237ml
HISMILE£10.064.3★2,853 rev
Colgate Peroxyl Antiseptic Mint Flavour 300ml Mouthwash Relieves Minor Mouth and Gum Irritations (Pack of 1)
Colgate£3.844.7★2,251 rev
Hismile v34 Colour Corrector Tooth Stain Removal Purple Toothpaste Hismile V34 Tooth Colour Corrector
HISMILE£8.803.4★72,358 rev
Hismile Tooth Armour Fluoride Free Toothpaste Serum Nano Hydroxyapatite Toothpaste Appropriate for Sensitive Teeth Supports Tooth Enamel Niacinamide Toothpaste Advanced Enamel Support | 20 ml
HISMILE£12.383.9★238 rev
Newest
by launch dateHismile Tooth Armour Fluoride Free Toothpaste Serum Nano Hydroxyapatite Toothpaste Appropriate for Sensitive Teeth Supports Tooth Enamel Niacinamide Toothpaste Advanced Enamel Support | 20 ml
HISMILE£12.38238 rev
Hismile iD Stain Whitening Mouthwash Gunk Removing Mouthwash for Fresh Breath Hydrogen Peroxide Mouthwash to Promote Whiter Teeth Alcohol-Free Mouthwash with Essential Oils 237ml
HISMILE£10.062,853 rev
Hismile v34 Colour Corrector Tooth Stain Removal Purple Toothpaste Hismile V34 Tooth Colour Corrector
HISMILE£8.8072,358 rev
Colgate Peroxyl Antiseptic Mint Flavour 300ml Mouthwash Relieves Minor Mouth and Gum Irritations (Pack of 1)
Colgate£3.842,251 rev
Trending
90-day click momentumHismile Tooth Armour Fluoride Free Toothpaste Serum Nano Hydroxyapatite Toothpaste Appropriate for Sensitive Teeth Supports Tooth Enamel Niacinamide Toothpaste Advanced Enamel Support | 20 ml
HISMILE£12.383.9★
Hismile iD Stain Whitening Mouthwash Gunk Removing Mouthwash for Fresh Breath Hydrogen Peroxide Mouthwash to Promote Whiter Teeth Alcohol-Free Mouthwash with Essential Oils 237ml
HISMILE£10.064.3★
Colgate Peroxyl Antiseptic Mint Flavour 300ml Mouthwash Relieves Minor Mouth and Gum Irritations (Pack of 1)
Colgate£3.844.7★
Hismile v34 Colour Corrector Tooth Stain Removal Purple Toothpaste Hismile V34 Tooth Colour Corrector
HISMILE£8.803.4★
What buyers say about hydrogen peroxide mouthwash
What buyers praise and complain about, mined from review topics.What buyers love
“Finally a good product for oral hygiene”
“The reviews are fairly spot on”
“The taste is fresh, pleasant enough”
“It helps remove surface stains and brightens teeth,”
“Does what is being advertised”
“the cleaning results work well”
“Good price”
“Fresh Breath”
“Lovely fresh feel”
“Helped with sensitivity”
What buyers complain about
“Taste is mild”
“Waste of money”
“During it was hard to keep in my mouth”
“Doesnt do as stated”
“DOESN'T WORK”
“I also found it quite difficult to open initially”
“The liquid itself is a brown colour rather than what I expected to be purple”
“the bubblemint flavour gum”
“Did it remove stains”
“But the liquid itself has a brown colouring -”
Top return reasons
Common questions
- Is hydrogen peroxide mouthwash profitable to sell on Amazon United Kingdom?
- The niche generates £1.1M/yr across 4 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -18.6%. Flapen's verdict: Skip it (45/100).
- How competitive is the hydrogen peroxide mouthwash niche?
- 2 brands and 14 sellers compete. The top 5 products take 100% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in hydrogen peroxide mouthwash?
- Top complaints mined from reviews: Taste-Overall, Value For Money, Oral Hygiene. The return rate is 0.1%.
- What does it cost to enter the hydrogen peroxide mouthwash niche?
- Listings span £3.84–£12.38; the average listing price is £8.77 (sweet spot $15–$100). The average incumbent carries 19,425 reviews — the moat a new listing must climb.