Here are some possibilities, and why:
* The Gorilla: While not the largest primate, gorillas have the largest canine teeth in the primate world. These teeth can be over 2 inches long!
* The Orangutan: Orangutans have the largest overall dentition (meaning the total size of their teeth). They have massive molars, which are the grinding teeth at the back of the mouth.
* The Baboon: Baboons have remarkably strong molars and powerful jaws, which are adapted for crushing tough food. They are often cited as having the largest cheek teeth.
Ultimately, there's no clear winner because "biggest" can be interpreted in different ways. The best answer is: it depends on what you're looking for!