In the past, bleaching agents used for producing professional sensitivity. Today, products intended for bleaching, such as gels, have less concentration to decrease the sensitivity and in turn provide the benefits of whitening. The sensitivity can occur in individuals when they eat hot or very cold foods after undergoing a whitening treatment, but usually disappears after 48 hours and stops completely when treatment is completed.

If you experience sensitivity, there are several ways to delete it:

* If using a bucket to apply the product, you must use it for less time.
* It should be brushed with toothpaste for sensitive teeth contain potassium nitrate.
* Ask your dentist or pharmacist for a product with fluoride to help re-mineralize the teeth. You can use it to brush or position in the tank and use it for a period of four minutes before and after whitening your teeth.
* Stop whitening treatment for several days to allow their teeth are adapted to the procedure. Within 24 hours, the sensitivity will cease. The longer you whiten your teeth, the lower sensitivity you will experience.

In some cases, your dentist may disapprove of tooth whitening:

* If you have periodontal disease, attrition, dental caries or tooth sensitivity.
* If you are pregnant or lactating.
* If you have crowns or veneers on anterior teeth that can not be bleached.