Teeth whitening, with its various forms and methods is the latest craze in town but is also a major cause of tooth sensitivity. Some people experience teeth whitening problems that cause them to discontinue their teeth whitening treatment. Some of the problems that may arise on or after a teeth whitening procedure include gum irritation, cumbersome mouth trays, leakage of the whitening agent, uneven teeth whitening or less than the desired whitening results and general discomfort during the procedure. These problems can occur but can be helped by choosing a good teeth whitening product, practicing careful and proper application and following your dentist's advice.