Some patients inquire about problems with their teeth and go to the dental clinic for examination, and the doctor recommends crown lengthening and later restoration. The question of whether crown lengthening is painful or not, according to feedback from patients after years of surgery, most patients feel mild discomfort and do not need to take medication, and the symptoms usually subside after 48 hours. In order to minimize discomfort, doctors take certain measures before, during and after surgery: 1. Before surgery, we should fully communicate with patients to dispel their doubts and relieve their tension; some patients can inhale laughing gas to make them completely relaxed and take painless anesthesia so that patients can complete their preoperative preparation without realizing it; 2. During surgery, we should reassure patients, communicate verbally, understand patients’ feelings, and more Minimally invasive treatment is used to achieve the effect of small wound, good closure, less pollution and good healing, which reduces postoperative complications such as postoperative swelling and pain; 3. After surgery, more attention should be paid to rest, avoid strenuous activities, avoid teeth in the operative area when brushing, lightly brush the remaining teeth, and mouthwash should be routinely included to maintain oral hygiene. Through the above measures, patients had a better experience and most of them did not have imaginary pain.