Yeah, this! Also, if you still use manual brush (don't), use soft bristle and be gental. Harder is not better when it comes to tooth brushing. Don't do what you typically see in movies.

As for your gums, they don't grow back I believe, but you can get surgery of sorts by using other parts of your mouth and stick them in your gums. See; https://www.youtube.com/watch?v=tF6EgSM5TlA