Should be fine for your teeth as long as you a) make sure to rinse your mouth out afterwards and b) don't brush your teeth immediately before or after drinking the vinegar.

I've been drinking it on and off for a few years and haven't noticed anything negative. I will drink it for months at a time and I mostly do it for my allergies. I mix probably 2 tbsp in a cup of water and drink it. Have you tried mixing it with water and applying it to your skin?

Yea I tried it as a toner for a while but it didn't really do much for me topically so Im guessing my acne is hormonal???