Age: There is a direct correlation between the color of the teeth and age. Over the years, the teeth become darker as a result of deterioration and the accumulation of stains. Clarity and thickness: While all teeth show some translucency, those that are opaque and thick have an advantage: they look lighter, shinier and respond better to whitening. Teeth that are thinner and more transparent, the front in particular, have less pigment, which is needed for the whitening. Transparency is the only case that cannot be corrected by any form of teeth whitening. Eating Habits: Regular consumption of red wine, coffee, tea, cola-type drinks, carrots, oranges, beets or other beverages and foods with strong coloring substances, causes considerable staining over the years. In addition, acidic foods such as citrus fruits and vinegar contribute to enamel erosion. As a result, the surface becomes more transparent and the yellow dentin appears even more. Smoking: Nicotine leaves brownish residue, which is slowly absorbed into the tooth structure and cause intrinsic discoloration. Grinding: Most frequently caused by stress, teeth grinding (gnashing) can add to micro cracking in the teeth and can cause the biting edges to darken. Trauma: Falls and other injuries can produce sizable cracks in the teeth, which collect large amounts of stains and debris.