揭秘牙齿中的VIP 5类牙齿需重点保护

　　Some of our 32 adult teeth are more vulnerable to decay and damage than others. Here, London dentist Dr Charles Ferber reveals where the dangers lie.
　　你知道吗？在成人的32颗恒牙中，有的牙齿要更容易遭受损伤和腐蚀，想要有一口漂亮又健康的牙齿，除了日常的清洁护理之外，还应对这一类“VIP牙”进行重点保护。

（图片来源于网络）

　　INCISORS

　　门牙

　　Incisors are the eight teeth at the front of your mouth — four at the top, four at the bottom.

　　门牙是分布于口腔下颚前方的八颗牙齿，四颗在上，四颗在下。

　　PROBLEMS: The central incisors are most vulnerable, but those in the lower jaw are particularly affected by teeth grinding, which 8 per cent of us do unconsciously.

　　问题：位于中央位置的门牙是非常容易受到腐蚀的，而下颚的门牙则直接则特别容易遭受磨损。

　　Your lower central incisors are more -yellow because the enamel is thinner, revealing the yellowish tissue (dentine) that gives teeth their strength.

　　下门牙很容易呈现出黄色，这是因为珐琅质较薄而露出了黄色的组织，也就是牙本质的“真面目”，而这样以外便使得下门牙异常的坚硬。

　　The inside of these incisors is also particularly prone to tartar because there are -salivary glands here.

　　但因为唾液腺位置的缘故，门牙上也非常容易有牙垢的出现。

　　Minerals in saliva combine with plaque to form hardened tartar. A build-up of tartar can cause -irritation that gradually makes the gum and jawbone shrink.

　　唾液中的矿物质在结合之后，会形成硬化的斑块牙垢，而当牙垢积累到一定的程度之后，可能会引起牙龈与颚骨的萎缩。