A great smile can significantly boost your confidence and how other people view you. The appearance of your teeth is an important part of your smile and the way you look overall. Unfortunately, many lifestyle factors and the seemingly routine things you do day after day can discolour your teeth over time and contribute to the quality of your smile. These include excessive consumption of coffee, tea and red wine, as well as food and drinks with strong colouring. Another major cause of discolouration is smoking, which can affect your smile not only by causing wrinkles to form around your mouth, but can also make your teeth appear yellow.