Right. Then you can avoid problems and keep your teeth healthy.

没错，这样就可以避免问题发生，并保持牙齿健康。

Plaque is the main enemy of healthy teeth. Everyone has plaque.

牙斑是一口好牙的劲敌。每个人都有牙斑。

A healthy tooth percussed with a metal instrument gives a metallic sound.

用金属器械对健康的牙齿作叩诊则发出金属声。

Plaque is the main enemy of healthy teeth.

牙菌斑是健康牙齿的主要敌人。

So this is a beautiful, red, healthy tooth, and what happens is a cavity makes a hole in your tooth, and it begins to rot right down to the root or the vein in your tooth, and that causes you pain.

这是一颗美丽、红色、健康的牙齿，结果是蛀牙在你的牙齿上开了一个洞，它开始腐烂到牙齿的根部或静脉， 这会引起你的疼痛。