Philips Sonicare C1 ProResults Replacement Toothbrush Heads, Hx6013/63, White 3-pack

These brush heads fit the best electric toothbrush I have tried, and I have tried several. I like the heads because they do a fine job cleaning my teeth, and they are gentle on my gums. I like the blue bristles that fade to tell one when to change the head for a new one. The heads seem expensive, but they don't cost any more than a good manual toothbrush. I have had not trouble with the bristles breaking down or falling out. I highly recommend these replacement heads. Oh, they can be a little stiff to put on the first time.