i'm an avid brusher (2x a day) and i floss every night. i drink one cup of coffee in the a.m., and occasionally have a cola in the afternoon but it's only a once in a while treat. it seems that my teeth just get stained soooo fast! during the day i usually drink a few glasses of water with a wedge of lemon squeezed into it. are my beverages causing weakened enamels, which would make me more prone to staining? i'm really just guessing here, so if anyone has any reccomendations on some factual info, i would love it! also, it seems to me that my teeth look kinda see-through on the ends (maybe about 1/4-1/3 of the end parts). could this all be related? TIA!!!!