sealant：6岁左右后面长出4个新的大牙和现有的大牙到10岁后换的新大牙。
我家：７岁时做后面长出的大牙sealant，１２岁时做换的新大牙sealant。
"The dentist, dental hygienist or assistant first cleans and dries the tooth to be treated, then paints a thin layer of liquid plastic material on the pits and fissures of the tooth. After application of the plastic liquid, blue spectrum natural light is shined on the applied material for a few seconds to cure the plastic. Alternatively, some brands of sealants self-cure via a chemical process."
我家：７岁时做后面长出的大牙sealant，１２岁时做换的新大牙sealant。
"The dentist, dental hygienist or assistant first cleans and dries the tooth to be treated, then paints a thin layer of liquid plastic material on the pits and fissures of the tooth. After application of the plastic liquid, blue spectrum natural light is shined on the applied material for a few seconds to cure the plastic. Alternatively, some brands of sealants self-cure via a chemical process."
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