How long does an antibiotic take to reduce pain of a tooth infection?

My dentist prescribed an antibiotic for toothache. I had root canal 4 days ago and the pain is still here so as he is out of the country, the nurse said take the prescription (which he had given a week prior to the root canal treatment but I hadn't taken). Anyhow I started the dose 24 hours ago (3 times a day... show more My dentist prescribed an antibiotic for toothache. I had root canal 4 days ago and the pain is still here so as he is out of the country, the nurse said take the prescription (which he had given a week prior to the root canal treatment but I hadn't taken). Anyhow I started the dose 24 hours ago (3 times a day I take it). The pain hasn't reduced at all. How long does it normally take to reduce the pain and the infection?
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