---
title: "Sp 4 Ultra Whitening — $6K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/sp-4-ultra-whitening"
last_updated: "2026-08-11T06:56:47.423Z"
locale: en
meta:
description: "Niche score 44/100 · $6K/yr market · 12K searches/yr · $15.14 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 44/100 · $6K/yr market · 12K searches/yr · $15.14 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Sp 4 Ultra Whitening — $6K/yr Amazon US Niche (2026) - Flapen"
---
# **sp 4 ultra whitening**
**Skip it**
A small market ($6K/yr) — this niche doesn't clear our bar today.
Market size 2Growth 15Conversion 41Competition 39Returns 99Price range 63Avg price 75Brand share 57Review moat 78Quality gap 48
**Returns**
**Incredible****0.3%**
return rate — above 5% kills the launch gate
**Review moat**
**Great****431.5**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Great****$15.14**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$8.97–$25.33**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****71%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Okay****3.3%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****62%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Bad****-20.1%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$6K**
$6K/yr · 12K searches
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, sp 4 ultra whitening is a $6K/yr Amazon United States market (12K searches/yr). The top 5 brands hold 71% of demand. Demand peaks in Jan–Feb–Jul–Aug. Verdict: Skip it — 44/100.
Data updated Jul 14, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **sp 4 ultra whitening market data**
- **Units sold / yr**
- **250–500**
- avg 0–100/product
- **Revenue / yr**
- **$4K–$8K**
- units × avg price
- **Conversion rate**
- **3.3%**
- **Avg BSR**
- **#1,256**
- **Page quality**
- **0%**
- **Prime**
- **56%**
- **Sponsored**
- **81%**
- **Out of stock**
- **18.1%**
- **Avg brand age**
- **40 months**
- **Avg seller age**
- **199 days**
## **Competition & brand share**
The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**12 **▲rising
**Sellers**
**21**
**Top-5 brand share**
**71%**
Top 20: 98%
**Top-5 click share**
**62%**
Top 20: 100%
**Open market**
**20%**
- MnPalettey24% - sayram13% - Hymhzy12% - SITUDAC11% - Generic10% - YAYASHI9%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -20.1% search growth over the last 90 days.
2K2KSpike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan, Feb, Jul, Aug · busiest ÷ quietest = 3.4×
[**Open Trend **](https://flapen.com/research/us/health-household/sp-4-ultra-whitening/trend)
## **Top sp 4 ultra whitening search terms**
- **sp4**3K/yr-30.8%0.7% conv. - **yayashi**1K/yr+1.6%8.7% conv. - **sp4 toothpaste whitening**1K/yr-13.2%1.5% conv. - **sp 4**972/yr-17.6%1.8% conv. - **yayashi sp-4 probiotic whitening toothpaste**878/yr-44.3%1.4% conv. - **sp-4 probiotics whitening toothpaste**602/yr-5.2%0.6% conv. - **sp-4**848/yr-25.7%3.8% conv. - **sp 4 toothpaste**1K/yr+4.3%1.4% conv. - **sp-4 toothpaste**1K/yr-14.4%6.3% conv. - **yayashi sp-4**426/yr-48.5%1.5% conv. [**All search terms **](https://flapen.com/research/us/health-household/sp-4-ultra-whitening/search-terms)
## **Top sp 4 ultra whitening 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%5%$30310%$60715%$91020%$1K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)2 products missing review or click data not plotted
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Ultra SP-4 Probiotic Whitening Toothpaste (2pcs Red)**MnPalettey**$15.89**4.3★11 rev](https://www.amazon.com/dp/B0CT93R3WJ) [2**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) [3**Nano Hydroxyapatite Toothpastes for Enamel Protection Fluoride Free**SITUDAC**$18.23**4.3★2,943 rev](https://www.amazon.com/dp/B0DNW5WNW4) [4**Sayram SP4 EDC Pouch Waxed Canvas Compact EDC Pocket Organizer Zippered Pocket Pouch for Men Mini EDC Organizer for Change Notebook Tactical Pen Flashlight (Oil Wax Dark Blue)**sayram**$16.79**4.5★177 rev](https://www.amazon.com/dp/B0CKV57TGH) [5**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)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**SP-4 Probiotic Whitening Toothpaste 4.23 Oz Ultra+ Probiotic-4 Toothpaste for Bright-Looking Smile and Fresh Breath (4.23 Oz Pack of 2)**MUZOIEU**$8.97**0 rev3w ago](https://www.amazon.com/dp/B0H5WSWFNF) [**3 Pcs SP-4 Oral Care Toothpaste Gently Polishes to Help Clean Surface Stains Double Peppermint for Long-Lasting Fresh Breath Daily Stain Protection for Oral Health 4.23 fl oz**Generic**$9.98**1 rev2mo ago](https://www.amazon.com/dp/B0H1WRDT5T) [**SP-4 Ultra Brightening Toothpaste Deep Cleaning Stain Removal Oral Care with Xylitol & Peppermint Fresh Breath Enamel Protection for Daily Use 120G**Generic**$12.57**0 rev3mo ago](https://www.amazon.com/dp/B0GWCSSLLY) [**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) [**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)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**SP-4 Probiotic Whitening Toothpaste 4.23 Oz Ultra+ Probiotic-4 Toothpaste for Bright-Looking Smile and Fresh Breath (4.23 Oz Pack of 2)**MUZOIEU**$8.97**0.0★**▲ 243%**](https://www.amazon.com/dp/B0H5WSWFNF) [**3 Pcs SP-4 Oral Care Toothpaste Gently Polishes to Help Clean Surface Stains Double Peppermint for Long-Lasting Fresh Breath Daily Stain Protection for Oral Health 4.23 fl oz**Generic**$9.98**5.0★**▲ 241%**](https://www.amazon.com/dp/B0H1WRDT5T) [**SP-4 Ultra Brightening Toothpaste Deep Cleaning Stain Removal Oral Care with Xylitol & Peppermint Fresh Breath Enamel Protection for Daily Use 120G**Generic**$12.57**0.0★**▲ 240%**](https://www.amazon.com/dp/B0GWCSSLLY) [**Sayram SP4 EDC Pouch Waxed Canvas Compact EDC Pocket Organizer Zippered Pocket Pouch for Men Mini EDC Organizer for Change Notebook Tactical Pen Flashlight (Oil Wax Dark Blue)**sayram**$16.79**4.5★**▲ 235%**](https://www.amazon.com/dp/B0CKV57TGH) [**KR Strikeforce Bowling Shoes and Hammer SP-4 Grey Felt Sole- Right Handed Bowler**KR Strikeforce**$19.49**4.5★**▲ 204%**](https://www.amazon.com/dp/B01M71XSZ0)
**~~View all trending →~~**
## **What buyers say about sp 4 ultra whitening**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**22%
*“no complaints”*
**Tooth Brightening**21%
*“Teeth appears a bit brighter”*
**Tooth Sensitivity**10%
*“Totally amazed at how well it works for sensitive teeth”*
**Efficiency**8%
*“Efficient”*
**Advertised Vs Actual Product**7%
*“As advertised”*
**Cleansing**6%
*“It cleans well”*
**Value For Money**6%
*“Much cheaper”*
**Ease Of Cleaning**4%
*“I'm giving the toothpaste 5 stars because it really cleans”*
**Brightness/Shine/Glow**3%
*“Nice Whitening”*
**Lather**2%
*“I like all the foam be ause it completely covers and treats my gums and they feel better and”*
### **What buyers complain about **
**Functionality-Overall**18%
*“Didnt work”*
**Advertised Vs Actual Product**12%
*“Not as advertised”*
**Texture/Consistency-Overall**9%
*“has gummy texture”*
**Moist/Dry**8%
*“the toothpaste is dry”*
**Value For Money**6%
*“These are amazing a little expensive”*
**Ease Of Use**5%
*“hard to close and air gets in and product clumps up”*
**Hard Feel**5%
*“hard as a rock”*
**Color**5%
*“Not the color expected”*
**Ease Of Cleaning**4%
*“it does NOT leave a clean”*
**Jamming/Clogging**4%
*“the cap and dispenser need some work - I've purchased several and every one has a clogged dispenser/cap”*
### **Top return reasons **
**Advertised Vs Actual Product**40%
**Functionality-Overall**8%
**Ingredients-Overall**6%
**Defective Material/Parts**5%
**Size-Overall**5%
**Smell**4%
**Ease Of Cleaning**3%
**Hard Feel**3%
**Ease Of Use**3%
**Ethically/Sustainably Sourced**3%
## **Common questions**
- **Is sp 4 ultra whitening profitable to sell on Amazon United States?**
- The niche generates $6K/yr across 16 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is -20.1%. Flapen's verdict: Skip it (44/100).
- **How competitive is the sp 4 ultra whitening niche?**
- 12 brands and 21 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 71% of demand.
- **What do buyers complain about in sp 4 ultra whitening?**
- Top complaints mined from reviews: Functionality-Overall, Advertised Vs Actual Product, Texture/Consistency-Overall. The return rate is 0.3%.
- **When does demand for sp 4 ultra whitening peak?**
- Demand peaks in Jan–Feb–Jul–Aug; the busiest month runs 3.4× the quietest.
- **What does it cost to enter the sp 4 ultra whitening niche?**
- Listings span $8.97–$25.33; the average listing price is $15.14 (sweet spot $15–$100). The average incumbent carries 432 reviews — the moat a new listing must climb.
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