One of the commonly used synonyms for "sets teeth" is "grinds teeth", which refers to the involuntary act of clenching and grinding one's teeth, often as a result of tension or frustration. Another synonym is "gnashes teeth", which is similar to grinding teeth but may imply a greater degree of anger or dissatisfaction. "Bares teeth" is also a possible synonym, although this phrase may connote a more aggressive or threatening posture. "Clinches teeth" is another alternative, indicating a firm, determined grip on one's teeth. Overall, these synonyms suggest a physical manifestation of stress, discomfort, or aggression, often indicating an emotional response to a situation or circumstance.