Bests & Worsts Reviews from Amazon

This from my hygienist: "Get a toothpaste whose active ingredient is potassium nitrate, NOT stannous fluoride. PN is the one that bonds best with tooth enamel. Incredibly, their own "repair and protect" brand of Synsodyne has SF as the active ingredient. Not only that, but apparenly Synsodyne can and has switched which of their brands has the potassium nitrate. This one has it. But I would check each and every time you make a purchase to make sure that the current Synsodyne brand still has PN as the active ingredient.