(Disclaimer: This article is for general use only. To protect patient privacy, the information in the following content has been processed) Abstract: A middle-aged woman came to the hospital with discolored upper teeth. However, many years later she noticed that her upper teeth had become black and yellow, which affected the aesthetics and made her uncomfortable when gnawing on things, before she went to the hospital for dental care. After oral examination and X-ray examination, she was diagnosed with pulpal necrosis, and after communication, she agreed to undergo root canal treatment and then full crown restoration, which not only removed the necrotic tissue in the root canal but also improved the aesthetics, and the patient was satisfied with the treatment. The patient was satisfied with the treatment. [Basic Information] Female, 40 years old [Disease Type] Pulp Necrosis [Hospital] Inner Mongolia Autonomous Region Women’s and Children’s Hospital [Consultation Date] December 2020 [Treatment Plan] Root canal treatment [Treatment Period] Two outpatient treatments, once/week; 3-month outpatient follow-up; 6-month follow-up [Treatment Result] The current treatment result is good I. Initial Consultation A middle-aged female came to the clinic with discolored upper teeth. The patient reported that the color of her teeth was not good and she wanted to have a veneer to improve her appearance. After detailed oral examination and medical history, we learned that the woman had fallen down on her bicycle when she was young and bumped her face and upper teeth, but the patient did not feel any discomfort at that time, so she did not care. But many years later, she found that her upper teeth had become black and yellow, affecting her beauty, and she also felt uncomfortable gnawing on things, so she went to the hospital to see her teeth. Next, a routine oral examination was performed, which revealed good oral hygiene, normal occlusal relationship, percussion (-), probing (-), looseness (-), no abnormal gingiva, no response to hot and cold test, and X-ray dental film showed that: 13 no low-density image was seen at the root tip, and the diagnosis of pulp necrosis was summarized. After communication, the patient agreed to undergo root canal treatment and later restorative treatment of the tooth. The patient did not quite understand why root canal treatment was necessary before treatment. We explained to the patient that if the pulp necrosis was not treated with root canal but with veneer treatment directly, periapical inflammation would occur later, which would affect the stability of the tooth and the restorative effect of the veneer. After detailed communication with the patient, the patient understands the importance of root canal treatment, so that the patient can better cooperate with the doctor to complete the treatment. For the first time, the pulp is opened and uncovered, the root canal is flushed and sealed, and the patient is seen 1 week later for root canal preparation and filling, and the tooth is filled. After the root canal preparation and root canal filling, there may be a slight swelling and pain of the tooth and other discomfort, do not worry too much, the general symptoms last about 3 days, if the discomfort is not obvious without special treatment, if the pain symptoms are obvious, you can take oral anti-inflammatory drugs and pain medication. After the above treatment, the patient was observed for 2 weeks and then referred to the Department of Prosthodontics for full crown restoration. 2 times of treatment, the patient cooperated very well and there was no obvious pain during the whole process. Third, the treatment effect Before treatment, the affected teeth had obvious symptoms of food gnawing discomfort, after treatment, the affected teeth gnawing function returned to normal; before the restoration treatment, the tooth color was gray and lusterless, poor aesthetics, after treatment, the affected teeth were restored with all-ceramic crowns, beautiful shape and color, restoring the patient’s self-confidence. More importantly, patients learn that tooth discoloration not only affects aesthetics, but also leads to necrosis of the tooth pulp. Through a series of systematic and effective treatment, both the removal of necrotic tissue in the root canal and the improvement of aesthetics, the patient was satisfied with the results of the treatment. IV. Precautions The patient’s cooperation was high, and we are glad that the patient not only solved the aesthetic problem that was on his mind, but also cured the pulpal necrosis. However, for outpatients, it is important to note that during root canal treatment, do not chew food with the treated tooth to prevent increased pain in the treated tooth and longitudinal cracking of the crown and root. After the treatment is finished, it is recommended to follow up with the doctor regularly, once in 3 months for outpatient follow-up and once in 6 months for review. In daily life, to develop good oral habits, brushing should be ensured at least 2 times a day for about 3 minutes each time to ensure brushing time; for foreign bodies entrapped in teeth, it is recommended to use dental floss stick to clean. The diet should be light and avoid stimulating diet, and the intake of sweets should be properly controlled. V. Personal insight The early symptoms of pulp necrosis are generally not obvious pain, which leads many patients with the same case patients did not seek timely consultation, only because of tooth discoloration to the hospital to see the teeth. It is not known that patients with acute pulpitis are accompanied by severe pain, but patients with pulp necrosis usually have no pain symptoms and are often accompanied by tooth discoloration. Although the affected tooth is positioned forward and has a better view during treatment, its root canals are relatively small and occasionally have double root canals or bifurcated root canals, which also brings inconvenience to root canal treatment and sometimes requires the application of an oral microscope, ultrasonic root canal treatment instruments, and mechanical nickel-titanium root canal preparation instruments. As the public awareness of oral disease protection increases, it is recommended to do at least 1 oral examination per year to achieve early detection and treatment as much as possible.