A 23-year-old male presented with a 3-day history of soreness in his lower left back jaw. Clinical examination revealed #16 was supraerupted and occluding on the gingiva of #17, which was partially erupted with erythema, exudate and pain on palpation. Radiographs showed #17 was partially bony impacted. The patient was diagnosed with pericoronitis of #17. The treatment plan included an operculectomy of #17, antibiotics for 10 days, and scheduling extraction of #17 under local anesthesia.