There are a multitude of factors which cause discolouration of our teeth. Many completely beyond our control, others are lifestyle choices. Discolouration can be caused by medications, if you have been prescribed a medication by your doctor continue to take it.

Extrinsic Factors

These are what cause of teeth to discolour from the outside.

1. Foods – oily foods and fried foods
2. Drinks – red wine, coffee, tea
3. Medicines – antibiotics 
4. Smoking
5. Poor oral hygiene

Intrinsic Factors

These are what cause our teeth to discolour from the inside.

1. Trauma to teeth, even trauma to baby teeth can affect the colour of adult teeth.
2. History of disease – liver, kidney disease 
3. Medications – Roacctunae, Tetracycline, Amoxil