I have aslo been suffering with this on my front 2 teeth, they look greyish cause of lack of eneamel at the end of the teeth, and my gums are reseading quite alot and making my teeth sensitive, i asked my dentist if they could do anything has it looks like they are wearing away at the bottom of them! i also have indentationss and a line going down 1 of them, the dentist just offerd me venners which i think is a bit exteme, but do not know what else to do!