Your teeth can look dark and yellow for a multitude of reasons including smoking, diet age and genetics. Whatever the cause there is almost always some form of dark tooth treatment which can help to lighten teeth for an improved cosmetic appearance.
This patient was concerned that her teeth were not as white as she would like. What is noticeable in this case is that the canines are right next to the central teeth, this means there is in actual fact a tooth missing at the front. The canines are naturally darker and yellow but because this lady has a tooth missing the canine is further forwards and this brings the yellowing effect further forwards in the mouth. Whitening her entire smile can not only lighten the dark canine teeth but whiten all of the teeth together to create a more youthful appearance.