I bought these to add the flossing benefit , but were so stiff I didn't know how there could be any flossing going on. My teeth and gums started bothering me so I Went to the dentist and he said these were too stiff and harmful to teeth and to no longer use. Multipack, expensive, and clearly could not return. Stick to the soft replacement heads and protect your teeth. No way to get a contact/email for Oral B to ask for replacement with regular ones.

One very annoying flaw: they brush your teeth fine but do you know what happens when there are holes in the shaft right where you need to form a seal around it with your lips? Spit and toothpaste dribbles down the shaft and onto the handle while you use it. And I see the newer iO models still have this! Did anyone involved in designing this actually use it?

The flosser heads are horrible. They are painful and tear up my mouth. How does Oral B get away with selling these detrimental, masochistic brush heads?

I used to buy some Precision heads, and they were useless. In just two weeks those heads were discolored and became useless.

So sorry I bought this brush..knocking my teeth and only good for BIG mouths. Does not work as described. Can I use a different head on this base. No way to id it.

I bought a huge pack of these from Costco to replace my original brushes. These may work for some people, but for me they really hurt my gums. Now I need to buy more :(

Not like the one that came with my original toothbrush.

I like these but they dont stay clean/good for a long time i do feel like the rubber bristels clean my teeth better good heads :)

I usually buy these replacement heads or the sensitive ones and I never have a problem with how good they work and clean your teeth.

These toothbrush heads give your mouth a super clean feeling. When we switched to an electric toothbrush, I found these heads to be, by far, our favorites.