Losing teeth in your forties is not normal and can be caused by trauma, periodontitis, caries and other reasons. Under normal circumstances, if there is no associated dental disease, such as periodontitis, dental caries and other diseases, teeth will not fall out in the forties. Generally older people over sixty years old will start to lose their teeth, and older people with healthy teeth will not even start to lose their teeth until they are seventy or eighty years old. 1. Trauma: losing teeth in your forties may be caused by trauma. If a traumatic impact may cause the root of the tooth to loosen or come out directly from the alveolar bone, it may cause tooth loss. If a traumatic impact causes the root of the tooth to fracture, it can also lead to tooth loss. 2. Periodontitis: Periodontitis is the most common cause of tooth loss. It is also the main cause. In most cases, it is due to calculus on the gums to produce persistent stimulation, triggering inflammation of the gums, long-term inflammatory stimulation may cause periodontitis. When periodontitis is severe, it will lead to loose teeth, and the situation of losing teeth may occur. 3. Dental caries: If the patient himself has dental caries, serious cases of tooth loss may occur. The hard tissues of the teeth are damaged by caries, serious caries in the hard bite, there may be caries partially lost, if caries continue to develop, it may be corroded to only part of the tooth root remains. The loss of teeth in the forties is an abnormal phenomenon, it is recommended that patients go to the regular hospital dentistry in time for relevant examinations, identify the cause of the disease and then actively carry out treatment.