Would not purchase again
I took a chance on purchasing these replacement heads but thought for the price, they were worth trying.  The brush head is very small, which isn't terrible and I got used to it quickly.  However, after a week, the brush tip seems to bend while in use causing a gap-- and a pinch!  I tried to lessen the pressure I put on the brush, but that did not seem to work and the pinching continued.  I changed the brush head for a new one and it seemed better.  Then within days, the pinching started again.  Unfortunately, I would not recommend these brushes.
Rating: 1 stars