I would tell my pre-teen self that I was beautiful over and over again until I started to believe it. I'm still trying to figure out where I went from thinking I was hot sh1t (~ 4th grade) to thinking I was ugly/fat (~6th grade?).

Other than that? Nothing. There are decisions in my life that I've regretted on occasion, but I wouldn't go back and change any of them. If I did, I wouldn't be the person I am now. I wouldn't have met my husband or be living the life I have now and I'm pretty happy with out things turned out.

By the way, I DID brush my teeth (and flossed) like clockwork and I still had to go through the process of replacing all those HUGE metal fillings with crowns about 8 years ago including gum surgery. Some of us are just not blessed with strong teeth and gums. So don't beat up your young self - it probably wouldn't have mattered!