The filling method for cryptic cracks is mainly determined according to the degree of cryptic cracks. Generally, superficial cracks can be filled with enamel filler, moderate ones can be repaired with resin, and those with deep cryptic cracks need root canal treatment before crown repair. 1. Superficial cracks: Generally, cracks occurring solely on the surface of the enamel will not adversely affect the health of the tooth, but in order to prevent pathogenic bacteria from entering the tooth through the cracks and leading to cavities, it is necessary to apply a layer of enamel bonding agent on the surface of the enamel and then carry out light curing. 2. Medium cracks: If the cracks have penetrated deep into the dentin layer, it is necessary to go to the hospital stomatology department to adjust and grind the tooth bevel to prevent the deepening of the hidden cracks by excessive biting force, and it is necessary to polish the hidden cracks and then use resin and other fillings for preventive filling. 3. Cracks are too deep: If the tooth is painful with hot and cold stimulation and spontaneous pain after cracking, it is possible that the cracks are deep into the pulp cavity, leading to infection of the nerve and thus causing symptoms of pulpitis, which requires root canal treatment of the tooth, and after the treatment is completed, the tooth also needs to be ground down to make a ceramic tooth to cover the abutment tooth. The filling method for a cracked tooth needs to be determined according to the degree of the crack, and it is best to go to the hospital stomatology department to find a doctor for a detailed examination before treatment.