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牙齿在几岁前应该长齐?

牙齿在几岁前应该长齐?

通常乳牙换牙时,会从下腭门牙开始换起,依顺序往内为侧门牙、犬齿、第一小臼齿、第二小臼齿。但这样的顺序并不完全符合所有人,也有些会跳着长,例如大门牙、侧门牙长完后,就直接换第二小臼齿,最后才长犬齿及第一小臼齿。另外要注意,恒牙的第一大臼齿通常会在六岁时长出,又称「六岁齿」,这颗牙齿常被误以为是乳牙,且因位在最后面,不容易清洁,常有蛀牙发生。家长要特别提醒小朋友好好注意保养清洁。至于第三大臼齿(即智齿)通常会到青少年或成年后才长。

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