Your jaw could be sore from remaining open, and injections can frequently cause a lingering soreness; the removal of teeth can also cause soreness. Remember, you’ve just had a surgery. The healing process takes time, and other factors like age and health will determine how sore you will be. Use a cold pack on the area, and take an over the counter anti-inflammatory; we like to recommend Ibuprofen (generic is fine, but you can use Advil or Motrin if you prefer name brands). Most ibuprofen is sold in 200 mg pills or capsules. Take two to four of them every four to six hours for as long as you are experiencing discomfort.