Tooth wear is considered a bad thing in the modern era. It can be painful and unsightly. Furthermore, a 2019 analysis of 706 studies involving tooth wear associated it with sleep disorders, oro-facial pain, oral dryness, GERD, and sleep bruxism (tooth grinding). However, several lines of research conclude that tooth wear, even in childhood, may be an evolutionary survival strategy. Especially as it pertains to proper jaw growth. The story is a little complicated, so I want to give you a little background and then explain how tooth wear may have been beneficial during our evolution.