||Buy a tooth whitening product that contains about 15% of the whitening agent. Too little of the whitening chemicals and the product will be ineffective. Too much, and your mouth may become irritated by the harshness of the chemical. Try out a mid-range product; if you tolerate it well and you aren't getting good results, then move to a higher concentration.
Brush your teeth following each meal to keep them from becoming discolored. Most beverages and foods can stain teeth, and brushing right after you've eaten prevents any stains from settling in. This is especially important when it comes to coffee.
If you are serious about whitening your teeth, you need to visit your dentist for regular cleanings. Professional cleaning can remove a great deal of the built up tartar and stains that naturally develop over time. Professional cleaning makes your teeth whiter and brighter and helps prevent gingivitis and dental caries.