One of the most common causes for yellowing teeth is aging. Under tooth enamel is an inner layer called dentin that’s yellow in colour. As you age, tooth enamel thins, and the yellow dentin underneath is exposed. Stains fall under two categories:

Surface stains such as:

• Plaque and calculus
• Tar from tobacco
• Tannins from red wine, tea and coffee
• Too much mouthwash (more than the recommended amount)

Internal Stains are pigments within the internal tooth structure and occur during or after teeth develop. Internal stains can occur due to:

• Illness and fever
• Excessive antibiotic use (Tetracycline)
• Medical conditions
• Excessively high fluoride levels