Calcium is absolutely required for dental structures. It is required for the enamel, or the hard outer covering of the teeth, and the bones in the jaw that support the teeth. Imagine what happens to the teeth and jaws when the body is not getting enough calcium to keep them healthy. Bones of the jaw weaken and teeth soften and become more porous. Therefore, it is paramount that if you are not getting your RDA of calcium, you should supplement.
Additionally, periodontal disease causes bone and tooth loss, and bone rarely regenerates. If you lose bone, teeth have nothing to hold them and fall out. This problem may be so serious that bone grafts could be required, but no treatment in itself is a magic bullet to eliminate all dental problems. The mouth is itself a complex system, so we need to think about applying several different protocols to correct these problems.
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