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Smoking cigarettes or chewing tobacco can cause stained and yellow teeth. Nicotine causes brown stains that penetrate the groves and pits of tooth enamel, and can be hard to remove by brushing alone. T...

Smoking cigarettes or chewing tobacco can cause stained and yellow teeth. Nicotine causes brown stains that penetrate the groves and pits of tooth enamel, and can be hard to remove by brushing alone. The longer you smoke, the more entrenched the stains become. Moreover, smoking causes bad breath and gum diseases, and even increases the risk for oral cancers.