This is the one of the most commonly asked questions that we get from our patient's parents. We try to minimize the discomfort of the injection by placing a gel that works as a local anesthetic and numbs the tissue were the injection will be administered. Profound local anesthesia is usually obtained five to ten minutes after the injection, depending on the area of the mouth where the anesthetic was placed. We always check to confirm that the area is numb before we begin to work. In cases of localized infection or trauma (like broken teeth) it is very difficult to obtain profound anesthesia, however we do have other means of supplementing the anesthetic (like conjoined use of nitrous-oxide gas, medications, or conscious sedation). Younger children, particularly pre-schoolers may interpret the feeling of numbness as pain, and therefore cry. Please follow the postoperative instructions that we give you, in order to minimize complications such as lip biting.