The phrase "making one's teeth chatter" refers to a physical response to cold, fear, or excitement. Its antonyms, on the other hand, are words and phrases that describe the opposite - a feeling of warmth or calm.
Some possible antonyms for "making one's teeth chatter" include cozy, comfortable, snug, relaxed, and tranquil. These words suggest a sense of comfort and peace, rather than the shivering and shaking associated with cold or fear.
Other antonyms might include words like tranquilize, soothe, calm, pacify, and relax. These words describe actions that can help to reduce anxiety and promote relaxation, soothing the mind and body in a way that might help to counteract the physical response of chattering teeth.