Periodontal disease is a serious infection under your gum line. ARESTIN® (minocycline hydrochloride) is an antibiotic that kills the bacteria that causes the infection. ARESTIN® starts working quickly, right at the source of infection, and keeps fighting bacteria long after you leave the dental office. 1,2 ARESTIN® fights infection and inflammation for 30 days,2 and provides significantly better results than scaling and root planing alone for up to 90 days.3