Hi. I have read your concern about yellowing of teeth despite any smoking habits. I would like to point out here firstly that natural tooth colour is yellowish white, and with age the yellowishness increases not just for you but for everyone. This comes from the foods we eat, water we drink and natural ageing processes of the teeth. What can you do about it? There are tooth whitening toothpastes available but these work mostly to whiten the teeth in the early stages or maintain whiteness post whitening treatments. The most common dental treatment patients opt for treating yellow teeth is tooth whitening. This is a simple procedure wherein tooth whitening agents can be applied on your teeth, either by the dentist in the clinic or by yourself at home. There are pros and cons of both. The other, more invasive and expensive method is dental  laminates or veneers. These are made from ceramic and can be fixed on to your teeth.