why is it that only teeth can have cavitys and not any other body part
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Teeth solidify soon after growth and don’t renew themselves to any significant degree after an injury. Being comprised of a rock, hydroxy apatite, teeth are reactive with acids. The remainder of the body is coated with living tissue skin and mucous membrane with blood circulation. Those slowly regenerate all the time, heal, to insulate the internal parts of the body from infection and damage. Barring a major injury, bones inside the body are shielded from the environment. Without adequate input of minerals and vitamins in the diet, bones can slowly slowly lose material, becoming hollow and brittle.
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