It's very hard one. If you you have a filling or crown in your mouth, then this head isn't good for your teeth. It's not Oral-B brand.

Don't waste your money. I bought 20 and threw them away. The bristles are week and don't vibrate with the head.

Horrible - almost every one stopped spinning after a week or less of use.

Hi The product came on time. After four uses the brush started to look like it was old .. bristles sticking all directions. Very disappointed with the product..

In the first run broke down

Brush heads are much smaller than original brand & very hard. Does not offer the same type of cleaning.

Doesn't fit exactly perfect but still works. The vibration stops as soon as it touches teeth so it's kind of pointless.

I did not like them. It does not clean as good as the regular brand.

muy mala calidad

Tore my gums to shreds. Bristles are terrible.