人的一生中只能长两次茅齿。一次是乳牙,一次是恒牙。如果恒牙坏了或掉了,就不能再生,既影响形象又可能疼痛,还影响对食物的咀嚼,加大胃部的工作压力,久而久之就会生病。我想发明一种牙齿生长剂,在牙齿受损后,注射或涂抹在牙龈上,就会长 A man's life can only be twice as long. Once the deciduous teeth, once the permanent teeth. If the permanent tooth is broken or lost, it can not be regenerated, affecting both the image and the pain. It also affects the chewing of food, increases the pressure on the stomach and over time it will get sick. I would like to invent a tooth growth agent that will grow when injected or applied to the gums after the teeth have been damaged