The periods of permanent tooth was . % and the periods of mixed tooth was 7.8%; The prevalence rate of ankyloglossia was 8.%; the rate of short labial frenum was .7%.
The periods of permanent tooth was . % and the periods of mixed tooth was 7.8%; The prevalence rate of ankyloglossia was 8.%; the rate of short labial frenum was .7%.
恒牙期错殆率.％,替牙期错率7.8％,舌系带过短率8.％,唇系带异常率.7％。