A perfect smile is a necessity when trying to make a good impression on people. Stained or yellowed teeth can often put a damper on what would be a charming smile. With all the pollution and staining foods that people consume on a day to day basis, staining and yellowing of the teeth have become a common problem. Food like coffee, tea, red wine and even cola have a staining effect on the teeth. Smokers are especially prone to the yellowing of teeth, as are people who consume any tobacco products. While tooth bleaching has existed for decades, previous bleaching methods were harsh and underdeveloped. They would often cause tooth sensitivity due to corrosion of the enamel and sometimes even lead to other oral or health problems as the chemicals used were not safe. This is why people often have an aversion to getting their teeth whitened and tend to forego the procedure even when recommended by professionals. Fortunately, modern teeth whitening technology, be it bleach or laser, is extremely gentle and only works to remove stains from the teeth.There are a number of different methods that dentists use to whiten teeth. Tooth bleaching is a popular method and involves putting a bleaching gel on the teeth which remove stains.