The answer to this question is mixed. Human teeth are generally designed to last a lifetime but since our lifespans increased dramatically and often our habits changed for worse it became a lot more challenging. It’s important two consider two external layers of teeth separately – first one, called dentin is the living part inside each tooth and research shows that it actually grows weaker with age in some people. This layer is similar to your bones – you can keep it in good shape by a proper diet that includes calcium, and vitamins like D, K2, C and E. Please note that hormonal changes related to menopause or pregnancy…