Why Did My Teeth Change Colour?
Food and Drink
Coffee, tea and red wine can stain your teeth. What do they have in common? Intense colour pigments called chromogens that attach to the white, outer part of your tooth enamel.
Over time, the outer enamel layer gets thinner with age, which allows more of the yellowish dentin to shows through.
Two chemicals found in tobacco create stubborn stains: Tar and nicotine. Tar is naturally dark. Nicotine is colourless until it’s mixed with oxygen. Then, it turns into a yellowish, surface-staining substance.
If you’ve been hit in the mouth, your tooth may change colour because it reacts to an injury by laying down more dentin, which is a darker layer under the enamel.
Tooth darkening can be a side effect of certain antihistamines, antipsychotics and high blood pressure medications. Young children who are exposed to antibiotics like tetracycline and doxycycline when their teeth are forming either in the womb or as a baby may have discoloration of their adult teeth later in life. Chemotherapy and head and neck radiation can also darken teeth.