Root canal treatment does not kill the nerve, but removes the nerve, but the specific need to remove the nerve needs to be judged according to the patient’s condition. If the patient is a pulpitis or periapical inflammation, generally speaking, the treatment needs to remove the nerve, through the removal of the nerve can effectively relieve the pain, to avoid the recurrence of pain symptoms in the later stage. If there is no nerve damage, only mild to moderate caries, does not involve the root of the tooth, generally do not need to remove the nerve. Patients usually need to pay attention to oral hygiene, eat more light food, brush teeth diligently and rinse, can be appropriate to use dental floss, to avoid food residues. Usually eat as little as possible spicy and stimulating food, easy to cause irritation to the teeth, affecting the recovery.