Why do my teeth change their color?
为什么我的牙齿会变色？
There are a number of factors that can cause the staining or discoloration of your teeth. Among the reasons are as follows: Smoking – Tobacco use can create stains on the teeth that are difficult to remove. There are two ingredients in tobacco that are the culprits of darker teeth: tar and nicotine. Tar is naturally dark while nicotine is colorless but turns yellowish when mixed with oxygen. Food & Beverages– Certain dark colored food and beverages such as coffee, tea, and red wine cause teeth stains. Their intense color pigments called chromogens stick to your teeth enamel causing discoloration. Aging– As you grow old, your enamel, which is the white outer shell of your teeth wears off. As a result, the softer and more yellowish part of your teeth called the dentin becomes more apparent. Medications – Teeth staining can be a side effect of certain medications such as antihistamines, antipsychotics, and certain high-blood pressure drugs. Even babies exposed to some antibiotics when their teeth are forming may have discoloration in their teeth later in their adult life. Trauma – Accidents that impact the mouth may affect your teeth color. Your tooth reacts to an injury by laying down more dentin, which is the darker layer of your teeth under the enamel.
有许多因素会导致牙齿染色或变色。 其中原因如下：
吸烟——吸烟会在牙齿上产生难以去除的污渍。 烟草中有两种成分是导致牙齿变黑的罪魁祸首：焦油和尼古丁。 焦油自然是深色的，而尼古丁是无色的，但与氧气混合后会变成黄色。
食品和饮料——某些深色食品和饮料，如咖啡、茶和红酒，会导致牙渍。 它们称为色原的强烈色素会粘在您的牙釉质上，导致变色。
老化——随着年龄的增长，牙釉质（牙齿的白色外壳）会磨损。 结果，被称为牙本质的牙齿更柔软、更黄的部分变得更加明显。
药物——牙齿染色可能是某些药物的副作用，例如抗组胺药、抗精神病药和某些高血压药物。 即使是在牙齿形成时接触某些抗生素的婴儿也可能在成年后的牙齿变色。
创伤——影响口腔的事故可能会影响您的牙齿颜色。 您的牙齿会通过沉积更多的牙本质来对损伤做出反应，牙本质是牙釉质下牙齿较暗的一层。