Teeth will naturally darken somewhat as we grow older, but there are some factors that might speed up the process. Your Centennial dentist will remind you of the tarnishing effects from coffee, and red wine, and that smoking, and drinking carbonated beverages will cause yellowing. Antihistamines, and some other medications can also discolor teeth.
Too much fluoride from mouthwash, or toothpaste can result in staining, and some materials used in dental fillings can make teeth look grey.
Talk to your Centennial dentist about whitening systems available today, and which one might be best for you.