Break easily. DON'T BUY these
I opened these a week ago and I've been through three (3) in the past seven days! The box says to replace every three months! They need to advertise "change every three days". Supposedly it's compatible with Philips Sonicare, which is what I have. I do not press hard when brushing teeth, but am very gentle as I have sensitive teeth. However, this can't handle even soft, gentle brushing. And I only brush my teeth twice a day.  I opened this box a week ago and I've gone through three brush heads and I'm on my 4th one! Unbelievable!
Rating: 1 stars