Are they compatible with the sboly sonic tooth brushes?

Yes, they are compatible with the sboly sonic tooth brushes, similar to model 507.

Is it fit to aqua sonic ?

NO, they aren't fit to AquaSonic.

Will these fit kipozi sonic toothbrush model ki-917?

Yes, they will fit. Thanks for your question.

Can you please tell me how I can purchase replacement brush heads that fit model 921?

The replacement brushes are on Amazon! Just type in for replacement brush heads for toothbrush model you have

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YUNCHI Electric Toothbrush Replacement Heads 5 Pack Compatible with Fairywill FW-507/508/551/917/959, for FW-D1/FW-D3/FW-D7/FW-D8, for Fairywill Toothbrush Refills - Black

YUNCHI Electric Toothbrush Replacement Heads 5 Pack Compatible with Fairywill FW-507/508/551/917/959, for FW-D1/FW-D3/FW-D7/FW-D8, for Fairywill Toothbrush Refills - Black

Product ID: 147021094

Details

Age Range (Description)
Kid
Brand
YUNCHI
Color
Black
Material
Nylon
Size
1 Count (Pack

⏳Replace every 3 months for peak hygiene

🖤Sleek black DuPont nylon bristles

🦷100% more stain & plaque removal

€ 17.05

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Description

🖤 Upgrade your brush game — because your smile deserves the best!

VALUE 5 PACK - Keep your smile fresh and flawless with a convenient pack of 5 replacement heads.
CLINICALLY PROVEN CLEAN - Removes 100% more stains and plaque than manual brushes for healthier gums.
GENTLE YET EFFECTIVE BRISTLES - Soft, end-rounded DuPont nylon bristles with trendy 'W' shape protect gums while delivering a deep clean.
PRECISION SONIC COMPATIBILITY - Perfectly fits Fairywill FW-507/508/551/917/959 and YUNCHI Y1 models for seamless use.
ADA RECOMMENDED REPLACEMENT CYCLE - Swap heads every 3 months to maintain optimal oral health and brush performance.

YUNCHI Electric Toothbrush Replacement Heads come in a 5-pack of black, soft DuPont nylon bristles designed to fit multiple Fairywill and YUNCHI electric toothbrush models. Engineered with a 'W' tooth-shape and end-rounded bristles, they remove 100% more stains and plaque than manual brushes while being gentle on gums. Recommended for replacement every 3 months, these heads ensure sustained oral hygiene and a professional clean at home.

Specifications

ASIN	B07Q2M7T6N
ASIN	B07Q2M7T6N
Age Range Description	Kid
Best Sellers Rank	#83,500 in Health & Household ( See Top 100 in Health & Household ) #497 in Electric Toothbrush Replacement Brush Heads
Brand Name	YUNCHI
Bristle Material	Nylon
Color	Black
Compatible Devices	fairywill
Customer Reviews	4.6 4.6 out of 5 stars (2,362)
Item Firmness Description	Soft
Item Form	ELLIPTICAL
Item model number	YCY1TH
Manufacturer	YUNCHI
Manufacturer	YUNCHI
Material Type	Nylon
Number of Items	5
Number of Pieces	5
Package Dimensions	4.13 x 4.13 x 0.75 inches; 1.13 ounces
Size	1 Count (Pack of 5)
UPC	738944820636
UPC	738944820636
Unit Count	5 Count

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€ 17.05

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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1 week ago

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