When you come in to the dentist's office for a teeth-whitening procedure, you probably have a few expectations: a whiter smile; a calm, relaxing environment; and an attentive, professional staff. What you may not expect is tooth sensitivity. But many patients experience this side effect during or after a whitening procedure. While for some the pain is manageable and only temporary, for others it can last from several minutes to several days. If you are considering a whitening procedure and either have experienced sensitivity in the past, or would like to reduce your risk of experiencing it in the future, try these tips before you whiten.