He's got more nerve than a bad tooth

Meaning

This describes someone who is extremely brazen, rude, or overly bold. A bad, abscessed tooth is notoriously sensitive and painful, so this saying implies the person is pushing boundaries in an irritating way.

Sassy, biting

Used in a sentence

• Asking for a raise after he showed up late all week? He has more nerve than a bad tooth.
• She waltzed in here like she owns the place; she has more nerve than a bad tooth.
• He has more nerve than a bad tooth, that one.