Update: I went to the drug store and is seems "stannous fluoride" is quite common in Crest brand toothpastes. All the "high-end" toothpastes had it, so it's not

Update: I went to the drug store and is seems "stannous fluoride" is quite common in Crest brand toothpastes. All the "high-end" toothpastes had it, so it's not a rare thing at all, just have to read the medical ingredients as you said.