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“六龄牙”是儿童6岁左右时,在乳磨牙的后方上下左右各萌出的恒磨牙。由于“六龄牙”不是替换乳牙而是直接长出的,往往被误认为乳牙而忽视保护。
“Six-year-old teeth” is a child around the age of 6, in the rear of the molars around the eruption of the permanent molars. As the “six-year-old teeth” instead of replacing primary teeth but directly grow, often mistaken for deciduous teeth and neglect of protection.