Tyga: Drops 45 Racks on New Grill (VIDEO)

Tyga just got a new jewelry store ... in his mouth.

Celeb jeweler Ben Baller just hooked Tyga up with the chompers ... dripping in 1400 diamonds.

At $45,000 and 18 carats ... it's the most expensive grill Baller's ever made.

On the other hand ... never a good idea to have more diamonds than your girl.