toothbrushI bought this toothbrush today. It is a Trisa brand toothbrush with that comes with two sets of bristles. The bristle heads snap on securely. I had to apply quite a bit of force to remove the head from the handle. I have twin daughters that are 15 years old. They could not get the head off the toothbrush. Asking someone stronger than you to change the head on your toothbrush after you have been using it for three months sounds kind of intimate.