全世界任何人种,牙齿都是乳白色的。一般来说,牙齿排列得是否整齐、其大小和形态主要受遗传的影响。而牙齿的色泽主要与后天因素有关,如口腔的微生态环境和人的饮食结构等都对牙齿色泽有重要影响。有些父母可能注意到,宝宝的牙齿萌出不久后色泽就出现变化,本来洁白的牙齿变成了棕黄色、灰黄色,甚至呈浅黑色。这是为什么呢? Any race around the world, the teeth are milky white. In general, the teeth are arranged neatly, its size and shape are mainly affected by the genetic. The color of the tooth is mainly related to the acquired factors, such as the oral micro-ecological environment and the human diet have a significant impact on the tooth color. Some parents may have noticed that the color of the baby’s teeth changed a bit shortly after eruption, and the white teeth had turned brown, grayish yellow and even light black. Why is this?