Looks like they had a particularly brutal orthodontists! Been there, done that. The ancient Maya used to file theirs to points, and inset turquoise and jade stones, just like our rap stars inset their teeth with diamonds.
Ornamentation of teeth and body parts that we once viewed as primitive has become attractive as a “statement” today. I would have never thought it could be - growing up when we saw movies of primitive customs such as these we all pretty much looked at it as ignorant.