Even though teeth whitening is quite safe and efficient, it is typical to feel sensitive after the procedure. Although this sensitivity is only transient, it can nevertheless be uncomfortable for the first few days following your whitening procedure. Fortunately, you can take measures to lessen this sensitivity following tooth whitening:  Use a desensitizing toothpaste to brush Apply a desensitizing gel  Taking painkillers Avoid consuming hot or cold beverages Eat and drink acid-free items Gently brush Use items with fluoride Drink with a straw