Are you asking about the harm of Taste King to teenagers? Tooth blackening, oral submucosal fibrosis, oral cancer. Betel nut contains a lot of crude fiber, and teenagers chew betel nut for a long time, which will cause food impaction, provide a suitable growth environment for the reproduction of dental plaque, and gradually turn teeth black. Arecoline can induce the apoptosis of oral mucosa cells and the deposition of collagen in oral submucosa tissue, and then induce oral lesions and even oral cancer. Therefore, long-term eat areca in adolescents will lead to oral cancer.