No: If the antibiotic was caused by a flare-up post root canal, then it should be fine. However, if the infection was caused by bacteria that may still be in the tooth, or a missed canal, the infection can come back. If the tooth is not restored properly with a permanent filling, the infection can come back.
For other people with similar names, see Sarah Allen (disambiguation). Sara Allen is an American songwriter best known for her work with the duo Hall & Oates. Though never married, she was in a long-time relationship with Daryl Hall until 2001. She contributed to many of the duo's hit singles, including Private Eyes, I Can't Go for That (No Can Do) and Maneater.
General John R. Allen is a retired four-star U.S. Marine General who served as the Commander of the NATO International Security Assistance Force and the Commander of U.S. Forces Afghanistan from 2011 to 2013, the pivotal point in the war.