what is hardness of this toothbrush? hard,medium,soft,ultra soft?

Ultra soft! I have ultra sensitive gums and this is the only electric toothbrush I have tried that doesn't feel like pins and needles as I brush.

why the 'X' in the brush-head?

According to the instructions it's a tooth polisher.

Would these be compatible with the Fairywill 2056?

I bought them for my 11 yr old and that was because she did supposly research on these. I really do not use any of this, but she does. I would have no clue if they are compatible. This was first time buying these for her since she insisted in being good quality.....

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BURST Replacement Electric Toothbrush Heads, Charcoal Bristles, BURST Sonic Toothbrush Compatible, Deep Clean, Healthier Smile, 3pk, Black

Product ID: 380418770

Details

Age range (description)
Adult
Brand
Burst
Colour
Black
Material
Nylon
Size
3 Count (Pack

⚡10x plaque removal power

🖤Charcoal-infused super-soft bristles

🦷Dentist-recommended interdental cut

¥8944

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🦷 Elevate your smile game with BURST — because your teeth deserve the best!

LONG LASTING 3 PACK - Three replacement heads keep your smile fresh for 9 months—never run out.
GENTLE YET EFFECTIVE - Super-soft charcoal bristles whiten teeth while protecting enamel and gums.
PLAQUE BUSTING POWER - Removes 10x more plaque than manual brushes for a deep, confident clean.
PRECISION INTERDENTAL DESIGN - Dentist-approved bristle cut reaches between teeth and under gums effortlessly.
SEAMLESS BURST COMPATIBILITY - Perfectly pairs with any BURST Original Sonic Toothbrush for adults.

BURST Replacement Electric Toothbrush Heads feature charcoal-infused, super-soft PBT nylon bristles with a dentist-recommended interdental cut, removing 10x more plaque than manual brushes. This 3-pack offers 9 months of deep cleaning and whitening, compatible with BURST Original Sonic Toothbrushes, delivering a healthier, brighter smile endorsed by over 25,000 dental professionals.

Specifications

ASIN	B084RGLZYY
ASIN	B084RGLZYY
Age Range Description	Adult
Best Sellers Rank	#96,740 in Health ( See Top 100 in Health ) #461 in Electric Toothbrush Replacement Brush Heads
Brand Name	Burst
Bristle Material	Polybutylene Terephthalate (PBT)
Color	Black
Compatible Devices	BURST Sonic Toothbrush Adult
Customer Reviews	4.8 4.8 out of 5 stars (3,644)
Customer reviews	4.8 4.8 out of 5 stars (3,644)
Item Firmness Description	Soft
Item Form	ELLIPTICAL
Item model number	BRST4000X3FBM
Manufacturer	BURST
Manufacturer	BURST
Material Type	Nylon
Model Name	BURST
Number of Items	1
Number of Pieces	3
Product Dimensions	12.7 x 7.62 x 3.81 cm; 41 g
Size	3 Count (Pack of 1)
UPC	850032281621
Unit Count	3.0 Count

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