There are three main reasons why your teeth may have brown stains:

1. Certain drinks
2. Smoking
3. Poor oral hygiene

Drinks
Some drinks unfortunately can stain your teeth. These include black coffee, tea, coke and red wine. Other foods such as curry can also stain your tea. Having your teeth professionally cleaned by a dentist every 6 months can decrease the chances of these permanently staining your teeth.

Smoking
It is well known that smoking has many adverse health affects that include an increase in risk of coronary heart disease and lung cancer. Smoking also affects your teeth and skin. Many people claim to be able to recognise a smoker simply by the colour of their teeth and skin. Smoking may leave a brownish stain on your teeth from the tar in the cigarette. Stopping smoking has many beneficial health effects for the whole body including your teeth. To find the best way to stop smoking for you consult your doctor.

Poor Oral Hygiene
Brown spots on your teeth may be a sign of tooth decay. Poor oral hygiene can also lead to a build up of plaque giving your teeth a yellowish appearance. By not brushing everyday, flossing and seeing your dentist regularly there is a high chance of caries forming on your teeth leading to discolouration. By improving your dental hygiene it may be possible to remove these stains.