Trigeminal neuralgia is a recurrent episode of severe pain within the distribution of the trigeminal nerve. It occurs mainly in middle-aged and elderly people, and is more common in women than men. The pain is mostly unilateral. The episodes are often unpredictable, sudden and abrupt, and each episode lasts from a few seconds to a few minutes, with normal intervals. Patients often describe the pain as tearing, electric shock, lightning, stabbing, cutting, or burning pain, which is often unbearable, and in severe cases, they roll over in bed and have suicidal thoughts. The course of the disease can become periodic attacks, some patients’ attack cycle is related to the climate, mostly in the winter and spring season. There are also a significant number of patients who start with toothache only, but after tooth extraction, the pain does not improve, and the scope of pain is gradually extended. The pain is often triggered by a slight touch at the eyebrow, eye, nose, upper lip, cheek, tongue, etc., so it is called “trigger point”. Patients are often afraid to wash their faces, shave, brush their teeth and eat for fear of painful attacks, so facial and oral hygiene is very poor, and the whole body is malnourished, emaciated, depressed and moody. Patients with prolonged illness can develop neurotrophic disorders, such as localized facial skin roughness, eyebrow loss and other manifestations, and even masticatory muscle atrophy, which seriously affects the work and life of patients.