No. Antibiotics are not necessary after root canal treatment. Root canal treatment is a very effective way to treat an infected tooth. The infection is removed from the inside of the tooth, and the tooth is sealed. This prevents the infection from coming back. In most cases, this is all needed to treat an infected tooth.
Sometimes, your dentist may recommend antibiotics after root canal treatment. This is usually due to the severity of the infection or if you have a medical condition that makes you more susceptible to infections. If your dentist does recommend antibiotics, it is important to take them as directed. This will help ensure the infection is completely gone and prevent it from returning.