These strips are the same as the 3D comb strips. I haven't had any sensitive feelings until now, and the cross did it right away. I leave it on for exactly 30 minutes for 4 days. MAN I have whiter teeth, a shade whiter with every use. I was even asked by someone how I got my teeth so white and that was only a few days ago. This is a price offer. I will continue to buy them. I'm curious as to why two weeks is enough. Normally I would throw the product in reviews because most of it sucks. But it's really great.
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