Ardisepste

Always drink a glass of water to rinse your mouth after drinking dark beverages.
When you use water to chase dark drinks, such as tea, coffee and wine, the water will stop the pigment in those beverages from staining teeth.

In order to get white teeth a good habit that you can do is to choose to eat food that naturally whitens teeth.
Examples of these are raw fruits and vegetables that scrub your teeth while you eat them.

Do you tend to grind your teeth? Do your best to get rid of this habit.
Avoid eating hard foods, chew some gum and relax as much as you can. If you grind your teeth at night, it is best to wear a mouth guard until this bad habit goes away.