In terms of worrying about dentistry, you'd be surprised how little you have to worry about if when you're staying in the wild without all the processed sugars and shit that is in most of our food. Some clean water, a brush and some floss and you'd be fine.
When I took an anthropology class in college, my professor asked the class, "so what do you guys think peoples' teeth were like in ancient times?"
And we were all like, "they probably didn't have teeth by the time they were 20!"
And he was like, "WRONG!"
He then went on to say that they had found skeletons that still had very healthy teeth on very elderly bodies from thousands of years ago. The problem, he said, came when people started farming and a bunch of starch and later on sugars started coming into the diet. All kinds of corn based foods really did a number on peoples' teeth. And yeah, in the modern day all the processed food and stuff, not to mention all kinds of super acidic beverages would really destroy your teeth.
But he said that hunter gatherer cultures that ate meat, berries, fruits and vegetables that they found growing out and about really didn't harm teeth at all. It's when the agrarian culture set in that it's been a problem and teeth brushing really became a necessity.
As far as regrowing. Emerald Mushroom pretty much has it. Basically, when your body initially grows, there are little things that read your DNA and tell it what to start making. So when you are a baby your body has the blueprint for arms and legs, fingers and teeth, etc. Then those things grow, and a little "blocker" comes in and places itself over the code. So in subsequent times when the reader is reading what DNA to start growing, it sees the blocker that is put over "arm", skips over it, and goes right on to something that does regenerate, like skin.
So basically, if you had a masterful control over your body to the extent that you could actually direct what goes where, you could definitely, in theory, regrow pretty much anything.
Honestly, I think it's possible. There are muscles in the body that most people don't use and never control. And at first it is hard, but you can gain control over those muscles and use them at will. The heart beats without you having to think about it, but there are ways to regulate your heart beat yourself. Maybe I'm optimistic
Sufficed to say, that having that much control over your body requires a lot of work.