Rick Ross has reason to smile … and not just ’cause he’s THE Boss, but because he’s a Boss with a brand new set of chompers.

We’re told the rapper recently headed down to Colombia for an appointment with celebrity and renowned Colombian dentist Dr. Mario Montoya, who performed a 6-hour procedure on Rick Ross to give him a brand-spankin’ new smile.

The procedure included 12 veneers on top and 12 on the bottom … and they were 100% porcelain. You can see from the before/after pics … the doc did an outstanding job. The “Hustlin” rapper was so excited about his new smile … dude wasted no time showing it off.

Now, the procedure Rick Ross got usually runs about $10,000. We’re told he got the procedure for free ’cause …. he’s THE BOSS. Can’t argue with that.

Montoya’s built a reputation as the guy to go to when ya need a new smile. As we reported … Tekashi69 also flew down to Colombia for a procedure that lasted about 5 hours.