The big teeth, i.e. molar teeth, molar teeth fall out and accidentally swallowed into the stomach, X-ray film should be taken at the first time to clarify the part of the tooth falling in, which can be taken out by using gastroscope or naturally discharged through the gastrointestinal tract, as follows. 1. Removal by gastroscopy: If the tooth has sharp edges, the tooth can be removed under gastroscopy to avoid adverse complications such as puncture and perforation of the digestive tract. 2. Natural expulsion: If the tooth cannot be removed by gastroscope, you can eat high-fiber foods, such as sweet potato, corn, barley, celery, apple, etc., with X-ray film tracking and observation, and wait for it to be naturally expelled through the gastrointestinal tract. It is recommended to go to the hospital in time and receive professional treatment early with the help of doctors.