First, you can begin with setting up and maintaining good dental hygiene habits. Good dental hygiene is very important, as it allows you to form the foundation for getting the white smile that you deserve.
A good hygiene habit is making certain that you brush at least two times a day. If you can do more, that is even better, although it is highly unrealistic to brush after every meal. If you can't brush after every meal, you will want to floss or use a toothpick to remove excess food from your teeth. Doing this removes decaying food and other unwanted substances so that your teeth can look better until you can brush.
After you have established this, the best way to get whiter teeth is to research into the various tooth whitening methods. While brushing twice a day will improve the coloring on your teeth, it will only do so much. If you are satisfied with a moderately white smile, then this is not important for you. However, as most people desire more than this, it is important that you look into all of the options open to you.
Despite this, there is no best way to get whiter teeth. This varies from person to person, as everyone has different needs and different health aspects that you are only aware of. If your teeth are sensitive, many of the methods aren't realistically open to you. If costs are an issue, other methods will not be available. The most important thing that you can do to get the whitest smile possible is to do your research and take the time to make the right decision for you.