How does dietary calcium benefit the teeth?

Prevents Ca loss: Calcium is an essential mineral for the function of all cells, and the body maintains blood levels of calcium in a narrow range. If the amount of calcium taken in doesn't keep up with the losses, the body pulls calcium out of the bones and teeth to keep the blood levels where they belong. So providing enough calcium from foods or supplements keeps more calcium in the bones & teeth.

Calcium: Dietary calcium may have some effect in the development of teeth in early childhood. The benefits of flouride in water is an example of stronger enamel. However, it has almost no effect on your teeth in adulthood. There are benefits to your nervous system which can affect your teeth, jaw and muscles. Aside from that, you may have an increase in tartar on teeth due to minerals in saliva.