It sounds like youhave what's called gum recession. Most of the time it is caused by aggressive brushing (weather you realize it or not) if you are using an electirc toothbrush, don't push hard while brushing, also, let the brush do the work!! You don't have to scrub back and forth. If you are using a manual reg. Toothbrush, all you need is just gentle circles at the gumline- don't scrub in a sawing motion, as well all do from time to time. There is no way to make the gum tissue go back to where it's suppose to be. If you have anymore questions about it go see you dentist- feel free to ask here as well. Good luck.