How long does it take before amoxicillin can effectively treat dental abscess?

May not work: Amoxicillin may not work. You might need anti-anaerobic coverage with Augmentin (amoxicillin and clavulanate) or clindamycin. Antibiotics will sometimes relieve and stabilize the infection after 3-5 days of treatment but dental abscesses usually require drilling to release the abscess and then root canal or dental extraction.

Be patient, patient: Antibiotics usually take 24 to 36 hours to relieve the pain a swelling of a dental infection. But you must understand that the cause of the infection needs to be treated, not just the symptoms. Otherwise, the infection will come back soon.