Male 40-year-old incisors loose is not normal, may be periodontitis, trauma and other reasons. 1. periodontitis: periodontitis may lead to alveolar bone resorption function, thus causing teeth loose, need to actively sensitive antibiotic anti-infection treatment, periodontal scaling, periodontal scraping can also be periodontal bone grafting and other methods of treatment. 2. Trauma: the incisors were hit by the external forces of extrusion, may lead to male 40 year old incisors loose, if the slightest rest to avoid eating hard objects, may be able to recover by itself, if the cause of pulpal inflammation, the need to carry out root canal treatment, and then can be taken to wear a crown to protect the teeth. Male 40-year-old loose incisors, there may be other reasons, you need to go to the hospital in time to check, follow the doctor’s instructions for treatment.