Bleaching or tooth whitening is a treatment method to remove darkness, stains and pigments that occur over time and due to foods containing pigments such as tea and coffee. Other causes of teeth discoloration include drinking colored drinks and spices, smoking, and aging. Factors that change the natural color of teeth can be found in the use of the following categories:

• coffee and tea
• All kinds of carbonated drinks
• alcoholic drinks
• All kinds of foods with thick color such as berries
• All kinds of sauces