The rules will have to be followed are:
1. continuous monitoring by the dentist for a course of treatment,
2. non-food consumption with coloring agents such as beets, red wine or whiskey, juices, tea, coffee, cola, carrots drinks, food blushed even soy or vinegar balsamic sauce, fruit (cherries, strawberries) chocolates, sweets preserves, and the use of tobacco or cigars, for at least a week after whitening, as well as
3. maintaining excellent oral hygiene by brushing (with a whitening toothpaste preferably) flossing, use mouthwash containing no chlorhexidine, after meals and before bedtime