Our diet is nothing like what our teeth evolved for. For example for most people, cutting down the amount of sugars (down to levels similar to our prehistoric ancestors) they consume can go a long way in protecting dental health (and general health for that matter)
Somewhere evolution is saying “well I gave you four perfectly decent extra molars that you insist on ripping out, if you kept those your teeth would be mostly fine for however long your are supposed to live. Mid 50’s?”
