Four solutions to make you smile with teeth

After carefully dressing up and adding a charming smile, give yourself a score in the mirror. Your smile is very sweet, but your slightly yellowish teeth can instantly make you feel down. Due to先天 and acquired reasons, our teeth are not white enough. Let professional dentists explain the secrets of whitening teeth. Bright white teeth are not far from us. Note: "先天" usually means "congenital" or "innate", but in this context, it refers to natural causes of tooth discoloration, so it is translated as "natural reasons" to fit the context.