There are several different options for tooth whitening that you should consider before based on your needs and expected results. It is a good idea to first learn about types of teeth stains. There are two types of staining, internal staining and external staining. External staining is staining from darker pigmented foods and drinks (usually coffee, tea, red wine, blueberries, etc.). External stains also come from smoking, which causes an accumulation on the outer surface of the teeth. Fortunately, these stains can be removed during your dental hygiene cleanings. Internal staining are stains that have travelled to the inner layer of the teeth and changed the shade of the teeth. Thankfully, there are solutions for both of these types of staining.