Is OP not aware that children lose their teeth and grow adult teeth at a certain age? Is this the level of ignorance we've sunk to as a society, where people don't even know things that happened to them?
Having been a juvenile human once myself, I remember losing teeth one at a time months apart for years on end from age 6 to about 12. I nor any of my classmates were ever in a state of "everything but incisors are weird little nubs."
Either he had some perfectly color-matched work done later in life, which seems pretty unlikely since they're all "I'm a 60-year-old large-animal veterinarian with decent teeth, who the fuck needs whitening", or my guy just had some really bad luck with his baby molars coming out late but all at once.