When the tooth decay to a certain degree, the patient will have hot and cold pain or spontaneous pain (aggravated at night), then it is necessary to carry out root canal treatment (kill the nerve), after root canal treatment, the tooth becomes brittle and discolored, the patient will feel unattractive, and the tooth may split after eating hard objects, then most doctors will recommend the patient to wrap the crown. Crown wrapping is a form of protection for teeth with large defects, but it does not mean that: if you wrap the tooth with a crown, the tooth will not break. The crown is eventually bonded to your own tooth with adhesive, and the adhesive will usually dissolve within 8-10, and your own tooth will still decay, so it is better to find some professional and public hospital for examination, and the doctor will be very responsible to make a treatment plan for you.