If there is toothache when eating sugar, most of the time there is tooth decay on the teeth, which is commonly known as worm teeth, we suggest the patient to go to the hospital for examination to clarify whether there are worm teeth. If it is cavity, we should remove the dirt inside and do the corresponding treatment according to whether it touches the nerve of the tooth, filling and root canal treatment can be done. If the tooth is hard and defective, if a piece of it is worn off or chipped off, filling treatment can be done according to the situation. If the defect area is small and does not cause pain, polishing treatment can be done to eliminate the symptoms. Of course, there is also a possibility that the tooth has a deep and large hard tissue defect, which may indeed be caused by insects or by wear. Some people chew on one side or bite with more force on one side, which can easily lead to excessive wear at a certain point of the tooth, and eating sugar or stimulation by cool or hot things can also cause soreness. In either case, it is recommended that patients first undergo a comprehensive oral examination to determine the cause of the problem and then carry out symptomatic treatment.