Many things we do on a regular basis can contribute to stained teeth, such as drinking coffee, tea, cola and red wine or smoking.

我们平时经常做的一些很普通的事情都会给牙齿留下斑点，比如说喝咖啡，茶和可乐，以及红酒，或是抽烟。

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Since porcelain is ceramic, and therefore glass-like, its surface is smooth and impervious and unlike older bonding materials, it will not be stained coffee, tea, red wine or cigarette smoking.

因为这种瓷料是陶瓷质地的，看起来像玻璃，与老式的物料不一样，其表面是光滑而且具有非渗透性，咖啡，茶叶红酒或是抽烟等都不会在其表面形成斑点。

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According to an expert, regular intake of chocolate, fruits, vegetables, red wine and tea help you against Alzheimer's disease.

据某位专家讲，定期摄入巧克力、水果、蔬菜、红酒和茶有助于防止老年痴呆。

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But apples contain high levels of an antioxidant flavonoid called quercetin which is also found abundantly in onions, tea and red wine, and may be important in protecting the lungs from the harmful effects of atmospheric pollutants and cigarette smoke.

BBC: Apples 'protect the lungs'

"Pomegranate juice contains the highest antioxidant capacity compared to other juices, red wine and green tea, " said Professor Michael Aviram, who led the team.

BBC: NEWS | Health | Pomegranates: the fruity panacea

Two medical websites, Medical News Today and WebMD, not only took the story seriously, but also bought into the explanation that the effect is caused by flavanols, which are found not just in cocoa, but also in red wine and green tea.

FORBES: Chocolate Makes Us Smarter. Or Does It?