---
title: "Yayashi Sp-4 Toothpaste — $36K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/yayashi-sp-4-toothpaste"
last_updated: "2026-08-09T09:07:13.059Z"
locale: en
meta:
description: "Niche score 40/100 · $36K/yr market · 37K searches/yr · $16.44 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 40/100 · $36K/yr market · 37K searches/yr · $16.44 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Yayashi Sp-4 Toothpaste — $36K/yr Amazon US Niche (2026) - Flapen"
---
# **yayashi sp-4 toothpaste**
**Skip it**
A small market ($36K/yr) — this niche doesn't clear our bar today.
Market size 9Growth 10Conversion 67Competition 17Returns 99Price range 73Avg price 79Brand share 38Review moat 24Quality gap 58
**Returns**
**Incredible****0.3%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$16.44**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$11.25–$25.33**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Good****6.0%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****82%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Bad****6,603.8**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****80%**
top-5 click share — a locked-up shelf
**Growth**
**Bad****-30.0%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$36K**
$36K/yr · 37K searches
According to Flapen's Amazon United States niche tracking, yayashi sp-4 toothpaste is a $36K/yr Amazon United States market (37K searches/yr). The top 5 brands hold 82% of demand. Demand peaks in Jun–Jul–Aug. Verdict: Skip it — 40/100.
Data updated Jul 14, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **yayashi sp-4 toothpaste market data**
- **Units sold / yr**
- **2K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$33K–$41K**
- units × avg price
- **Conversion rate**
- **6.0%**
- **Avg BSR**
- **#590**
- **Page quality**
- **0%**
- **Prime**
- **80%**
- **Sponsored**
- **70%**
- **Out of stock**
- **16.7%**
- **Avg brand age**
- **32 months**
- **Avg seller age**
- **163 days**
## **Competition & brand share**
The top 5 products capture 80% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**8 **▲rising
**Sellers**
**13**
**Top-5 brand share**
**82%**
Top 20: 96%
**Top-5 click share**
**80%**
Top 20: 100%
**Open market**
**12%**
- SITUDAC22% - YAYASHI21% - MnPalettey18% - Hymhzy14% - MSDRWIKEY8% - Zaucet6% - Open — no brand owns it (2 brands, 12%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -30.0% search growth over the last 90 days.
6K4KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jun, Jul, Aug · busiest ÷ quietest = 9.2×
[**Open Trend **](https://flapen.com/research/us/health-household/yayashi-sp-4-toothpaste/trend)
## **Top yayashi sp-4 toothpaste search terms**
- **probiotic whitening toothpaste**32K/yr-42.6%1.8% conv. - **yayashi**1K/yr+1.6%8.7% conv. - **sp4 toothpaste whitening**1K/yr-13.2%1.1% conv. - **yayashi sp-4 probiotic whitening toothpaste**878/yr-44.3%1.0% conv. - **sp-4 probiotics whitening toothpaste**602/yr-5.2%0.6% conv. - **yayashi sp-4**426/yr-48.5%1.5% conv. - **yayashi sp-4 toothpaste**251/yr+5.1%1.6% conv. - **sp4 probiotic toothpaste whitening**52/yr-77.8%0.0% conv. [**All search terms **](https://flapen.com/research/us/health-household/yayashi-sp-4-toothpaste/search-terms)
## **Top yayashi sp-4 toothpaste 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%10%$4K20%$7K30%$11K40%$14K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Nano Hydroxyapatite Toothpastes for Enamel Protection Fluoride Free**SITUDAC**$18.23**4.3★2,943 rev](https://www.amazon.com/dp/B0DNW5WNW4) [2**YAYASHI SP-6 Probiotic Whitening Toothpaste Advanced Formula with 6 Probiotics for Brighter Teeth & Healthier Gums Enamel-Friendly Fresh Peppermint Long-Lasting Clean**YAYASHI**$19.34**4.1★15 rev](https://www.amazon.com/dp/B0FB3LBYHG) [3**Ultra SP-4 Probiotic Whitening Toothpaste (2pcs Red)**MnPalettey**$15.89**4.3★11 rev](https://www.amazon.com/dp/B0CT93R3WJ) [4**Sp-6 Probiotic Whitening Toothpaste Sp-6 Ultra Whitening Toothpaste with a Fluoride Free Fresh Breath and Mint Flavored Enhancement Formula Beneficial for Oral Health! 2pc (2)**Hymhzy**$12.39**4.3★145 rev](https://www.amazon.com/dp/B0F8PCQ8CP) [5**SP-6 Probiotic Toothpaste - Niacinamide Whitening Toothpaste Enhanced Formula with 6 Probiotics for Teeth Whitening and Gum Health - Enamel-Safe Fluoride-Free Fresh Mint Flavor 4.9Oz (2)**Zaucet**$14.39**4.4★465 rev](https://www.amazon.com/dp/B0F2J2LC6V)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**YAYASHI SP-6 Probiotic Whitening Toothpaste Advanced Formula with 6 Probiotics for Brighter Teeth & Healthier Gums Enamel-Friendly Fresh Peppermint Long-Lasting Clean**YAYASHI**$19.34**15 rev1y ago](https://www.amazon.com/dp/B0FB3LBYHG) [**MSDRWIKEY 2-Pack Popping 7-Pro Whitening Toothpaste | Deep Whitening & 7 Probiotics for Oral Health | Purple Beads for Extra Freshness | Fluoride-Free**MSDRWIKEY**$16.64**697 rev1y ago](https://www.amazon.com/dp/B0F6N37XFK) [**SP-6 Probiotic Toothpaste - Niacinamide Whitening Toothpaste Enhanced Formula with 6 Probiotics for Teeth Whitening and Gum Health - Enamel-Safe Fluoride-Free Fresh Mint Flavor 4.9Oz (2)**Zaucet**$14.39**465 rev1y ago](https://www.amazon.com/dp/B0F2J2LC6V) [**Sp-6 Probiotic Whitening Toothpaste Sp-6 Ultra Whitening Toothpaste with a Fluoride Free Fresh Breath and Mint Flavored Enhancement Formula Beneficial for Oral Health! 2pc (2)**Hymhzy**$12.39**145 rev1y ago](https://www.amazon.com/dp/B0F8PCQ8CP) [**9.9% Hydroxyapatite Toothpaste - 2 Pack Protects Enamel and Strengthens Teeth Cleans and Cares for Oral Health Freshens Breath Non-Irritating Natural and Safe 8.46 Oz**--**$14.60**1,397 rev1y ago](https://www.amazon.com/dp/B0F25YRGYC)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**9.9% Hydroxyapatite Toothpaste - 2 Pack Protects Enamel and Strengthens Teeth Cleans and Cares for Oral Health Freshens Breath Non-Irritating Natural and Safe 8.46 Oz**--**$14.60**4.4★**▲ 663%**](https://www.amazon.com/dp/B0F25YRGYC) [**MSDRWIKEY 2-Pack Popping 7-Pro Whitening Toothpaste | Deep Whitening & 7 Probiotics for Oral Health | Purple Beads for Extra Freshness | Fluoride-Free**MSDRWIKEY**$16.64**4.2★**▲ 247%**](https://www.amazon.com/dp/B0F6N37XFK) [**LSYXGS SP-4 Probiotics Brightening Toothpaste Paste Whitening Unflavored 3 Count (Pack of 3)**LSYXGS**$25.33**5.0★**▲ 224%**](https://www.amazon.com/dp/B0CXLZZWPD) [**Sp-6 Probiotic Whitening Toothpaste Sp-6 Ultra Whitening Toothpaste with a Fluoride Free Fresh Breath and Mint Flavored Enhancement Formula Beneficial for Oral Health! 2pc (2)**Hymhzy**$12.39**4.3★**▲ 163%**](https://www.amazon.com/dp/B0F8PCQ8CP) [**YAYASHI SP-6 Probiotic Whitening Toothpaste Advanced Formula with 6 Probiotics for Brighter Teeth & Healthier Gums Enamel-Friendly Fresh Peppermint Long-Lasting Clean**YAYASHI**$19.34**4.1★**▲ 152%**](https://www.amazon.com/dp/B0FB3LBYHG)
**~~View all trending →~~**
## **What buyers say about yayashi sp-4 toothpaste**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Tooth Brightening**20%
*“Teeth appears a bit brighter”*
**Oral Hygiene**16%
*“Great for Sensitive Teeth”*
**Quality-Overall**10%
*“as this product is truly reliable”*
**Taste-Overall**7%
*“Good taste”*
**Tooth Sensitivity**6%
*“It didn't irritate gums”*
**Cleansing**5%
*“Cleans really well”*
**Value For Money**4%
*“Much cheaper”*
**Flavor**3%
*“Mild flavor”*
**Efficiency**3%
*“Efficient”*
**Advertised Vs Actual Product**3%
*“As advertised”*
### **What buyers complain about **
**Functionality-Overall**9%
*“Didnt work”*
**Oral Hygiene**8%
*“The chemical, sodium lauryl sulfate may have a possible side affect of mouth sores”*
**Value For Money**7%
*“Waste of money”*
**Tooth Brightening**7%
*“Does not whiten”*
**Advertised Vs Actual Product**6%
*“False Advertising”*
**Taste-Overall**5%
*“Doesn't taste great”*
**Tooth Sensitivity**3%
*“It can cause a rapid tooth decay and sensitive happen”*
**Color**3%
*“they appears a little bit whiter”*
**Breathability**2%
*“it doesnt give fresh breath”*
**Texture/Consistency-Overall**2%
*“has gummy texture”*
### **Top return reasons **
**Advertised Vs Actual Product**15%
**Tooth Brightening**12%
**Taste-Overall**12%
**Functionality-Overall**10%
**Tooth Sensitivity**7%
**Flavor**6%
**Ingredients-Overall**6%
**Oral Hygiene**4%
**Value For Money**4%
**Leak-Proof**3%
## **Common questions**
- **Is yayashi sp-4 toothpaste profitable to sell on Amazon United States?**
- The niche generates $36K/yr across 10 tracked products. 90-day search growth is -30.0%. Flapen's verdict: Skip it (40/100).
- **How competitive is the yayashi sp-4 toothpaste niche?**
- 8 brands and 13 sellers compete. The top 5 products take 80% of clicks and top 5 brands hold 82% of demand.
- **What do buyers complain about in yayashi sp-4 toothpaste?**
- Top complaints mined from reviews: Functionality-Overall, Oral Hygiene, Value For Money. The return rate is 0.3%.
- **When does demand for yayashi sp-4 toothpaste peak?**
- Demand peaks in Jun–Jul–Aug; the busiest month runs 9.2× the quietest.
- **What does it cost to enter the yayashi sp-4 toothpaste niche?**
- Listings span $11.25–$25.33; the average listing price is $16.44 (sweet spot $15–$100). The average incumbent carries 6,604 reviews — the moat a new listing must climb.
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