You should not use over the counter whitening treatments if you have problems such as gum disease, tooth decay or cavities. These whitening treatments contain some very strong chemicals that could cause a lot of pain and damage if you apply them over damaged teeth or if they come in content with diseased gums.

If you can't pay for necessary dental work, ask the dentist about possible payment plans. Many dental offices have plans that use installments either through a financial institution, or their office. This option makes it easier to afford dental care so you don't have to wait.