1. Certain drinks, like caffeine, soda pop, black tea, red wine, or candy, as well as smoking, dull the gleam of teeth. If you cannot deny yourself a pleasure of sipping a cup of strong coffee in the morning or a glass of red wine in the evening, or if you are having a puff every now and then, you need to take care of your teeth more carefully. Be sure to brush them thoroughly every time after you have drunk wine or tea, have eaten a candy, or smoked a cigarette. Whitening toothpastes, which contain polishing agents, can be helpful to a degree to remove stains from the surface of teeth, especially if they are used on a regular basis.