Your dentist will want to prescribe an antibiotic that will properly treat your illness. Penicillin-class antibiotics, such as penicillin and amoxicillin, are most typically used to treat tooth infections. For some forms of bacterial infections, an antibiotic called metronidazole may be prescribed. This drug can help destroy bacteria that cause other types of infections elsewhere in the body. Root canal therapy is a procedure that involves removing infected tissue from within the tooth, then filling it with material that prevents further infection while the tooth is repaired. During this process, any necrotic (dead) tissue surrounding the nerve is removed too. The filled cavity is sealed with a special filler material. Antibiotics are recommended during this time because remaining bacteria in the mouth could lead to another infection if more dental work is done at a later date. Root canal treatment is necessary for healthy teeth. If you are missing one or more teeth, your dentist may recommend a replacement tooth be placed into the space until your immune system recovers enough to fight off infection again. The best way to avoid needing a root canal is by keeping your teeth clean and visiting your dentist regularly for checkups and cleanings. If you do need a root canal, let your dentist know when you book your appointment so he can take care of any additional paperwork needed before the procedure starts.