UFC's Josh Koscheck -- Someone KO'd My Teeth ... Don't Worry, I've Got Backups

You know how tough Josh Koscheck is?? He tried to eat a steak last night ... without his two front teeth!!

The UFC superstar was leaving Boa Steakhouse ... looking a little more Michael Strahan-ish in the mouth region than usual -- so we had to ask, what's up with your grill?!

Don't worry, Josh always carries backups ... and popped in a couple of FAKE TEETH to fill in the gaps during our conversation (we asked about retirement, his answer is interesting).

See, Tiger Woods ... no reason to be so embarrassed!!