Question: what is the best vitamin for teeth?
Answer: Calcium. No surprises here — calcium is well known as a friend for teeth. ... 
Vitamin D. Vitamin D helps the body absorb calcium while boosting bone mineral density, so it's crucial to get an adequate amount of vitamin D to get the most out of your calcium intake. ... 
Potassium. ... 
Phosphorus. ... 
Vitamin K. ... 
Vitamin C. ... 
Vitamin A.