My parents pamper my daughter a lot and keep giving her chocolates and sweets, which is not good for her teeth. How do I wean her off the habit?

I would suggest preparing "snack packs" (that your daughter enjoys and you "approve") like what Jolin mentioned. At the end of the day, your parents just wants to offer your daughter treats. Just buy the snacks that your daughter currently likes and give it to them to offer to your daughter. This way, they get to give her what she likes and you need not worry about the chocolate and sweets. That being said, an indulgence once in a while is alright I guess. Because, sometimes, your parents may want to give something that they have chosen and bought for your girl. Let them know that you prefer them to give other snacks instead and keep chocolate and sweets to a minimal. I'm quite sure they will understand. :)