The phrase "sets one's teeth" is commonly known as a way to express gritting or clenching one's teeth. However, there are several synonyms that can be used interchangeably with this expression. Some of the common synonyms for "sets one's teeth" include "grinds one's teeth," "clenches one's jaw," "tightly bites down," and "compresses one's mouth." These expressions are typically used to indicate intense determination, anger, frustration, or pain. Additionally, they can serve as an effective way to describe physical or emotional reactions that are difficult to convey through words alone. Overall, using synonyms for "sets one's teeth" allows for more precise and dynamic communication.