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In response to your question, there isn’t a level of pain on the patient’s part that is considered acceptable to me. If I sense that the patient can feel something, I ask them and then let them know that I’d like to give them some more anesthetic so that they are comfortable. Using the standard dental injections, I am usually successful at getting patients numb. When that fails, I will usually go to the injection in the ligament, which gets the remainder of the patients numb. That injection is basically an injection into the bone, without having to drill directly into the bone.