Poor hygiene can also cause coffee-stained teeth. Everyone should brush at least two times per day--in the morning and night--and ideally in the middle of the day, as well. To stop further staining, consider brushing your teeth after drinking coffee. The fluoride in toothpaste mineralizes enamel, strengthening it and halting stains. If this is impossible, drink water to rinse the mouth or chew a stick of gum to trigger saliva production.
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