Completely anecdotal, my brother totally neglected his teeth when he was young. He just didn't bother brushing. His teeth were fine. I on the other hand have been a stickler for cleaning them, and they are totally knackered.

Perhaps you can get a layer of magic plaque that protects the teeth. Who knows. Mine just get worse. They used to feel dirty without a brush. Now they feel horrible without a brush and floss. Sometimes I just wish for all my teeth to be ripped out.