The incidence of children suffering from mottled teeth of children aged 8 to years was 9.0%、 .0% and . 7%,respectively;
The incidence of children suffering from mottled teeth of children aged 8 to years was 9.0%、 .0% and . 7%,respectively;
8~岁儿童氟斑牙患病率分别为 9.0%、 .0%和 . 7%;