Although genetics plays a big role in the base colour of your teeth, the colour of your teeth is also affected by your lifestyle habits. Other factors that contribute to thin enamel or excessive discolouration include: Bruxism (or teeth grinding) Brushing with activated charcoal Brushing with lemon juice & baking soda Brushing too vigorously Using a toothbrush with medium or firm bristles (we recommend soft!) Drinking coffee, tea, wine, and dark-coloured sodas Eating candy, sweet treats, citrus, balsamic vinegar, and tomatoes Chewing tobacco and smoking Plaque accumulation Tooth decay