How does infection set in after tooth extraction when you already took antibiotics before extraction?

I was given a course of antibiotics before extraction of ma upper tooth but now i believe the tooth next to it is infected %26amp; am on antibiotics again, why is this? how does infection generally set in after extraction, i always thought once you complete a course there doesnt be any infection even after extraction, any input plz, thanks.

How does infection set in after tooth extraction when you already took antibiotics before extraction?
if you have serious decay in an adjacent tooth. Antibiotics and super brushing aren't going to cure it.





plus your mouth is filled with million types of organisms. You can have a tooth decay problem caused by one type of bacteria and a gum problem caused by a different bacteria. The same antibiotic will not work as effectively for one than for the other.





Plus a clean wound heals better than a dirty wound. Are you doing gentle salt water rinses? Are you still maintaining your hygiene? Smoking? if not you can be increasing your chances of infection or reducing your chances of healing.





Antibiotics work only if the blood can get it delivered to the site of infection. Each tooth has a hollow core called the pulp which has blood vessels and a nerve. In a healthy tooth, the antibiotic can travel through the tooth through the vessels. In an unhealthy tooth, the nerve and blood vessels are damaged and the antibiotic will be unable to reach the tooth. Think of it as blocked tunnels. Root canals unblock the tunnels.





That's why the definitive treatment must be root canal or extraction. That's why antibiotics only "fix" teeth temporarily. Root canal takes out the bacteria in the tooth that the antibiotic can't reach and seals the tooth preventing new bacteria from invading.