more idioms involving “teeth”

Fight tooth and nail

To deeply oppose

“The labor union said it will fight management's reduced insurance benefits tooth and nail.”

Lie through one's teeth

To tell a big lie

“The bank robber lied through his teeth when the police asked him what was in his backpack.”

Armed to the teeth

Extremely well prepared

“The accountants are ready for the battle with the tax office; they are armed to the teeth with data.”

Grind one's teeth

To be worried and upset

“The sudden change in the company strategy has many of the mid-level managers grinding their teeth.”

Grit one's teeth

To carry on, though upset

“The reduced Christmas bonus has upset all of us, but we have to grit our teeth and work even harder.”