Most of his Taliban friends have more wives than teeth.
Wives vs Teeth
Explanation
Explain Bear
Hey, listen up! This joke is saying them Taliban dudes are missing a whole lotta teeth, but they got a whole lotta wives. It's kinda like sayin' they ain't got their priorities straight, or maybe they just ain't got good dental care. Either way, it's funny 'cause it's messed up, and you are messed up too! Ha!