Firefly Sonic Replacement Brush Heads, Compatible with Play Action Sonic and Sonic Toothbrushes, for Ages 3+, Pack of 3

This works for my son’s Sonic brush. However, they need to update the description. The grey piece gets stuck on the brush and made it confusing. Each brush has a grey sizer. Remove the old one before using a new one. See photos.

I love that I can get additional toothbrushes compatible with the sonic base! These are perfect! They fit great and are easy to use. Far better value than replacing the entire base.

Make sure the old grey piece comes off of the toothbrush. The new one is inside the replacement head! I didn't know this until I read the previous review. It gets stuck on the toothbrush when you pull it off. It fits his sonic the hedgehog toothbrush.

These set of replacement brush heads are good quality and great value. I like that they come in a set of 3.

Perfect. My son loves the sonic toothbrush as it really helps him to brush his teeth long enough and also helps coach him what to do. I was worried I’d have to buy a brand new one but this was amazing that it fits and the value is amazing! The bristles are more in the soft side for kids which I don’t mind but they do push down very easy

I bought these to replace my son’s toothbrush head on his Firefly Ironman toothbrush. It fit initially, but was too thick for the Ironman cover to fit over it.. This was workable since we had other toothbrush covers.. the bigger issue is that this toothbrush head always falls off mid brush.While this toothbrush head loosely fits the toothbrush, it does not fit securely at all and always falls off, landing on the floor or in the sink as my 5 year old brushes. It is not compatible.

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They fit the handle and perform as required.