https://www.vice.com/en_us/article/59nmp3/boy-had-more-than-500-teeth-in-a-bag-like-mass-in-his-mouth

A 7-year-old boy was brought to a dental college hospital in Chennai, India, complaining of swelling in his jaw. His parents were worried that it was cancer, according to a Saveetha Dental College news post, but the doctors found something else: a huge, bag-like mass filled with 526 tooth-like structures.

Yes, the boy had more than 500 teeth in his mouth.