Composer, I would *really* ask your dentist about using any kind of whitening product if you're missing enamel.
I don't have very white teeth. I had to take this iron supplement as a child that looked, smelled and tasted like tar - a spoonful every morning and every night. I still have the stains - the stuff was awful. But I also have really strong enamel - I've never had a cavity! So I sort of hate to mess with it...
Avatar - Isaac, my blue-fronted Amazon parrot. Adopted 9/7/07. Age 30 (my pet is older than me!)