So what’s the meaning behind that?

Uh, I mean I think it’s just clever and funny.  If you aren’t good to your teeth, you’re gonna end up with false teeth.”

Ohh ok, now I get it

Oh my gosh!!  You didn’t get that!?  I think that one is so funny, so cute.

Conclusion:

This little saying is a short, clever play on words.  My Uncle Steve told me that his Aunt used to say this to him and his cousins all the time.  Apparently, she had taken poor care of her teeth as a child and young adult.  She started having to wear false teeth in her late 50s.  With this precautionary tale in mind, it comes as no surprise that my Uncle Steve has a nice, pearly white smile.  “I didn’t wanna end up with chompers like hers,” he jokingly says of his Aunt.