I wondered what the special ingredient was that produces the claimed "Enamel Shield" in Crest ProHealth Toothpaste. Crest ads say that it is the "stannous fluoride" in the toothpaste. Most toothpastes today already contain stannous fluoride >> including plain old Crest. So by their own admission Crest seems to be saying that almost all toothpastes produce the magical "Enamel Shield" and thus Crest ProHealth Toothpaste is nothing new or special. Or am I missing something ?