Betel nut is a carcinogen, long-term consumption of betel nut may lead to oral ulcers, dental calculus, and even develop into oral cancer. 1. Oral ulcers: betel nut food hygiene problems, coupled with the long-term impact of betel nut alkali and other substances, as well as frequent chewing may lead to some damage to the oral mucosal tissues, and will gradually appear ulcers and other phenomena. 2. Dental calculus: eating betel nut for a long time will cause excessive wear and tear of the teeth, not only prone to dental caries, but also easy to make the teeth black, affecting the beauty of the teeth, and even lead to a large number of plaque growth, which is accompanied by dental calculus. 3. Oral cancer: in the process of chewing betel nut, the oral mucosa will continue to betel nut and betel nut contains a unique betel nut alkali and a variety of nitrosamine compounds and neutralization reaction, the oral cavity for a long time in this environment will make the mucous membrane fibrotic lesions, gradually induced oral cancer. In addition, chewing betel nut for a long time may also produce dependence on betel nut, if you chew betel nut for a long time or discomfort symptoms, you should consult a doctor in time for treatment.