---
title: "Hydrogen Peroxide Mouthwash — £1.1M/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/health-personal-care/hydrogen-peroxide-mouthwash"
last_updated: "2026-07-31T11:39:42.694Z"
locale: en
meta:
description: "Niche score 45/100 · £1.1M/yr market · 603K searches/yr · £8.77 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 45/100 · £1.1M/yr market · 603K searches/yr · £8.77 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Hydrogen Peroxide Mouthwash — £1.1M/yr Amazon UK Niche (2026) - Flapen"
---
# **hydrogen peroxide mouthwash**
**Skip it**
A concentrated shelf (top 5 take 100% of clicks) — this niche doesn't clear our bar today.
Market size 80Growth 16Conversion 100Competition 0Returns 100Price range 0Avg price 24Brand share 0Review moat 17Quality gap 90
**Conversion**
**Incredible****21.5%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Quality gap**
**Great****4.1★**
avg incumbent rating — lower means beatable quality
**Market size**
**Great****£1.1M**
£1.1M/yr · 603K searches
**Avg price**
**Bad****£8.77**
avg listing price — sweet spot $15–$100
**Review moat**
**Bad****19,425**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Bad****-18.6%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****100%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Price range**
**Bad****£3.84–£12.38**
cheapest 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 ~~](https://flapen.com/research/methodology)
## **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.
15K10KSpike '25Spike '26Prime Day '26Sep '25Oct '25Dec '25Feb '26Mar '26May '26Jun '26
[**Open Trend **](https://flapen.com/research/uk/health-personal-care/hydrogen-peroxide-mouthwash/trend)
## **Top hydrogen peroxide mouthwash search terms**
- **hismile**170K/yr-20.7%9.1% conv. - **hismile mouthwash**78K/yr-24.3%24.2% conv. - **hydrogen peroxide mouthwash**59K/yr+31.2%4.3% conv. - **hi smile**64K/yr-9.1%8.6% conv. - **peroxyl mouthwash**60K/yr-41.0%27.3% conv. - **hi smile mouthwash**29K/yr-8.0%27.2% conv. - **id stain whitening mouthwash**31K/yr-35.3%19.0% conv. - **peroxide mouthwash**12K/yr+103.2%7.6% conv. - **colgate peroxyl mouthwash**24K/yr-43.6%24.6% conv. - **id mouthwash**11K/yr-2.6%17.7% conv. [**All search terms **](https://flapen.com/research/uk/health-personal-care/hydrogen-peroxide-mouthwash/search-terms)
## **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.
0%20%£228K40%£455K60%£683K80%£910K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 4 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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**£10.06**4.3★2,853 rev](https://www.amazon.co.uk/dp/B0GC1X785H) [2**Colgate Peroxyl Antiseptic Mint Flavour 300ml Mouthwash Relieves Minor Mouth and Gum Irritations (Pack of 1)**Colgate**£3.84**4.7★2,251 rev](https://www.amazon.co.uk/dp/B015POPUPU) [3**Hismile v34 Colour Corrector Tooth Stain Removal Purple Toothpaste Hismile V34 Tooth Colour Corrector**HISMILE**£8.80**3.4★72,358 rev](https://www.amazon.co.uk/dp/B09LH36816) [4**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**£12.38**3.9★238 rev](https://www.amazon.co.uk/dp/B0GWD1ZG89)
### **Newest**
by launch date
[**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**£12.38**238 rev3mo ago](https://www.amazon.co.uk/dp/B0GWD1ZG89) [**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**£10.06**2,853 rev7mo ago](https://www.amazon.co.uk/dp/B0GC1X785H) [**Hismile v34 Colour Corrector Tooth Stain Removal Purple Toothpaste Hismile V34 Tooth Colour Corrector**HISMILE**£8.80**72,358 rev4y ago](https://www.amazon.co.uk/dp/B09LH36816) [**Colgate Peroxyl Antiseptic Mint Flavour 300ml Mouthwash Relieves Minor Mouth and Gum Irritations (Pack of 1)**Colgate**£3.84**2,251 rev10y ago](https://www.amazon.co.uk/dp/B015POPUPU)
### **Trending**
90-day click momentum
[**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**£12.38**3.9★**▲ 160%**](https://www.amazon.co.uk/dp/B0GWD1ZG89) [**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**£10.06**4.3★**▲ 20%**](https://www.amazon.co.uk/dp/B0GC1X785H) [**Colgate Peroxyl Antiseptic Mint Flavour 300ml Mouthwash Relieves Minor Mouth and Gum Irritations (Pack of 1)**Colgate**£3.84**4.7★**▼ 29%**](https://www.amazon.co.uk/dp/B015POPUPU) [**Hismile v34 Colour Corrector Tooth Stain Removal Purple Toothpaste Hismile V34 Tooth Colour Corrector**HISMILE**£8.80**3.4★**▼ 51%**](https://www.amazon.co.uk/dp/B09LH36816)
## **What buyers say about hydrogen peroxide mouthwash**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Oral Hygiene**22%
*“Finally a good product for oral hygiene”*
**Quality-Overall**9%
*“The reviews are fairly spot on”*
**Taste-Overall**9%
*“The taste is fresh, pleasant enough”*
**Tooth Brightening**8%
*“It helps remove surface stains and brightens teeth,”*
**Advertised Vs Actual Product**7%
*“Does what is being advertised”*
**Cleansing**6%
*“the cleaning results work well”*
**Value For Money**3%
*“Good price”*
**Breathability**3%
*“Fresh Breath”*
**Freshness**3%
*“Lovely fresh feel”*
**Tooth Sensitivity**3%
*“Helped with sensitivity”*
### **What buyers complain about **
**Taste-Overall**14%
*“Taste is mild”*
**Value For Money**12%
*“Waste of money”*
**Oral Hygiene**9%
*“During it was hard to keep in my mouth”*
**Advertised Vs Actual Product**5%
*“Doesnt do as stated”*
**Functionality-Overall**5%
*“DOESN'T WORK”*
**Ease Of Use**3%
*“I also found it quite difficult to open initially”*
**Color**2%
*“The liquid itself is a brown colour rather than what I expected to be purple”*
**Flavor**2%
*“the bubblemint flavour gum”*
**Stain Resistance**2%
*“Did it remove stains”*
**Color Fading/Discoloration**1%
*“But the liquid itself has a brown colouring -”*
### **Top return reasons **
**Functionality-Overall**26%
**Advertised Vs Actual Product**20%
**Leak-Proof**8%
**Taste-Overall**7%
**Value For Money**4%
**Tooth Sensitivity**4%
**Dispensing Mechanism**4%
**Ease Of Use**3%
**Tooth Brightening**3%
**Ingredients-Overall**2%
## **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.
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