More importantly, the more teeth you have in your mouth, the more evenly distributed are the biting forces. This reduces the stress to the jaw joints (i.e./T.M.J.) and surrounding bone and musculature.

The permanent dentition is much larger than the child's dentition to accommodate heavier biting forces and produce a natural smile.

With extraction, the remaining teeth are required to withstand more biting forces resulting not only in additional stress to the teeth and supporting bone, but to the jaw joints and muscles as well.