"Above & Beyond" Member (500+ posts)    Joined:  Jul 2008  Posts: 507  |    x..007,  I had the same problem and they switched me from Stannous to Sodium Fluoride.  After switching I have had no more problems with stained teeth. 
  There are numerous brands available, so ask you dentist, but as a reference I am using a 1.1% Sodium Fluoride product called Neutra Maxx 5000 Gel.          
Don TXN2bM0 Stage IVa SCC-Occult Primary FNA 6/6/08-SCC in node<2cm PET/CT 6/19/08-SCC in 2nd node<1cm HiRes CT 6/21/08 Exploratory,Tonsillectomy(benign),Right SND 6/23/08  PEG 7/3/08-11/6/08 35 TomoTherapy 7/16/08-9/04/08 No Chemo Clear PET/CT 11/15/08, 5/15/09, 5/28/10, 7/8/11
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