Paul Rudd may have a reputation as being a super nice guy, but he holds a grudge against one person — although he doesn't even remember his name.

The Ant-Man alum, who turns 56 on April 6, shared that he’s “so furious” at a dentist he saw years ago, telling the that he “screwed up my teeth.”

“I always had decent teeth, and I never had braces,” Rudd said, sharing that when he was in his “late 20s, early 30s” — which would have been after he starred in Clueless — he had an appointment “with a dentist I’d never been to before.”

The Death of a Unicorn star told the outlet that the dentist gave him bad news, saying: “‘You got six teeth that had cavities and I gotta take out these fillings and put in white fillings.’ And he goes, ‘On this one, you also gotta do some preventative stuff.’ And he had told my sister she needed to do it, too. “