If you are uncertain of whether or not that you will have a reaction to one of these products, you should be wary about trying one. If you fear an allergic reaction, you should contact your family doctor or dentist with the list of ingredients to find out prior to using the product in your mouth.
As these reactions can be present when you make use of one of these products, you must consider the question of "Can Tooth Whitening be harmful?". Unfortunately, the answer to this question is yes. As Crest White Strips can cause hives and other reactions, as well as can many other tooth whitening products, you need to approach this treatment like you would any medication or drug. While hives are not the only side effects possible from tooth whitening, it is one of the signs that you are allergic to the treatment that you are attempting.
If you have a problem with Crest White Strips and hives, you should end treatment immediately and consult with your family doctor and dentist to find out what method you should use in order to have whiter teeth. If you have problems with one type of this treatment, it is very possible that you will have problems with others. If you are careful, however, you should be able to use tooth whitening products without a high risk of reaction to it.