Teeth whitening is not something that you should ever attempt yourself without the help and advice of a professional dentist. It is quite an extreme treatment that, when applied incorrectly, can cause corrosion and damage to the teeth. If you would like to know more about tooth whitening, the best person to speak to directly is your dental practitioner.
Teeth whitening may be an option if you are unhappy with the colour of your teeth. However, a dentist is unlikely to recommend it if your teeth are not especially discoloured and you could end up with unnatural looking teeth. They may recommend other methods of protecting your teeth instead, such as drinking less tea or coffee and using a whitening toothpaste.
If you are sure that you do want your teeth whitened, talk thoroughly with your dentist about the colour you are going for. It’s important that you are going to be happy with the final result.