<s>[INST] i have slight swelling of my left cheek and a little under my eye which is causing eye pain on that side.  i think i may have an abscessed tooth from an old root canal (the crown fell off a year ago).  the tooth is dead, but can it form an abscess? i have no fever, just the swelling which has improved from the ibuprofen i took. [/INST] Hello, Yes, it may form abscess it may lead to cellulitis of cheek or inflammation of surrounding area. Use tablet amoxicillin and clavulinic acid 625 mg twice a day for five days. Tablet metronidazole 400 mg thrice a day for five days. Cold compression may useful. If symptoms not improved please consult with your dental surgeon he will examine and treat you accordingly. Take care. Hope I have answered your question. Let me know if I can assist you further.  </s>