Agreed, your bone tissue effectively has mini piezoelectric sensors, the more mechanical pressure you apply on them the more you signal for tissue 'reinforcemen

Agreed, your bone tissue effectively has mini piezoelectric sensors, the more mechanical pressure you apply on them the more you signal for tissue 'reinforcement', this leads to an increased _density_ (not growth) of the bone tissue in that region. Bone _growth_ during childhood and early adulthood is mostly hormone regulated AFAIK. There is nothing that I know that supports that earlier claim that chewing hard things makes your jaw bone 'grow'.