In addition, about thirty percent of the city's residents have dentine hypersensitivity, and teeth yellow and tone problem also nots allow to ignore.

此外，约百分之三十的城市居民有牙本质敏感问题，而牙齿偏黄和口气问题也不容忽视。

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They are abrasive and can wear your enamel away and in the long-term lead to sensitivity and darkening of your teeth as the enamel wears and the inner amber-coloured dentine becomes visible.

它们都有研磨作用，会磨损牙釉质，长此以往会导致牙齿敏感和发黑，因为牙釉质磨损会暴露出里面黄褐色的牙质。

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Dentine hypersensitivity is a sharp, sudden pain arising from the teeth when exposed to touch or hot and cold foods.

象牙质敏感是当牙齿接触或冷或热的食物所引起的急剧的，短暂的疼痛。

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