The information was that the replacement brushes fit all Interplak models except the listed ones. Mine was not on that list so I ordered. When I got the brushes they did not fit. Since I has opened the package I cannot return them. My dentist advised what I got were out of date brushes for older Interplak models.

These replacement heads were recommended to go with a certain Interplak toothbrush I was buying, but did not fit with the toothbrush ordered. Very annoying! I had to return the heads, but also returned the toothbrush because it had practically no cleaning power! Go with Oral B.

Conair Interplak Replacement Heads Bonus Pack

The write up says that it will fit all Conair Interplak bruches except for the push-on models. Not true, I have a NT7 model and these brushes do not fit. Amazon will accept back and said it will pay for sending them back, as well as refunding the original shipping cost.

Nice package of 2 big and 1 smaller brush. Great price! We like the interplak toothbrush dental products.

Conair Interplak Replacement Heads Bonus Pack

The brush heads work fine. For those who say performance is not so hot, try changing the battery in your toothbrush. Even rechargable batteries don't last forever, and when they are old, the brush heads perform poorly. (Note, however, that there are two versions of the battery for this same model of toothbrush and one is physically "wired on" while the other is easily removed.)All in all, it really is too bad that this model of electric toothbrush is being phased out. The Interplak model which works with these heads is far superiour to most of the "new and improved" models coming on to the market.