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Doctor insights on: Antibiotic For Root Canal Infection

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Dr. Jane van Dis
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12 years in practice
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Infection (Definition)

Infections are invasions of some other organism (fungus, bacteria, parasite) or viruses into places where they do not belong. For instance, we have normal gut bacteria that live within us without causing problems; however, when those penetrate the bowel wall and enter the bloodstream, ...Read more


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If there is still infection after the root canal and antibiotics don't treat it, what are symptoms of it, and does that mean the infection has spread?

Infection: Swelling/pain/fever are general signs of infection around the tooth or radiating to a adjacent area. Also a dental radiograph of the area would be very helpful to diagnose. ...Read more

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Dr. Jane van Dis
Board Certified
12 years in practice
43M people helped
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Is it possible that post-root canal infection will not recur when antibiotics have cleared it up?

Is it possible that post-root canal infection will not recur when antibiotics have cleared it up?

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. If there is a cavity still present, the infection can come back. ...Read more

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If I am allergic to three of the antibiotics used to treat my infection tooth. Can my body tolerate the substances used for a root canal?

If I am allergic to three of the antibiotics used to treat my infection tooth. Can my body tolerate the substances used for a root canal?

Yes: Antibiotics are sometimes given orally to decrease infection or prevent a flareup when root canals are performed. The materials used in root canals are not antibiotics, are internal of the tooth, and are not a problem for you. ...Read more

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Dr. Jane van Dis
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12 years in practice
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Do you really always need antibiotics after root canal treatment? Can you just wait and take it when you see infection started only.

Yes: The root canal is used to treat an infected tooth that is full of bacteria. Antibiotics will help eradicate the infection or bacteria. Why wait and see if an infection may arise. Simply take a round of antibiotics to ensure that an infection does not occur or is eradicated. ...Read more

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Need root canal. How long can it wait? I was given antibiotics for infection. No money- can I wait a month to get the root canal?

As : As you know antibiotics were given to you to control the infection and while taken them your root canal is supposed to be performed. Now if you have or need to wait one month, you will need to take again antibiotics two to three days prior to your procedure. I hope you will be pain free during this waiting period. Now let me inform you that, your infection will not be resolved until the root canal will be finished, and all bacteria coming from that infection will not only remain in that tooth area but will be traveling through your body ( brain, lungs, heart, kidneys etc). Please try to prioritize your budget and have your root canal done asap, and if you want to wait a month for your build up and crown, that will be more reasonable. Good luck! ...Read more

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I just got off an antibiotic for a tooth infection from a root canal that didn't take. Could i possibly have the infection again!?

I just got off an antibiotic for a tooth infection from a root canal that didn't take. Could i possibly have the infection again!?

See dentist: Yes, you can because the first antibiotic didn't kill the bacteria at the tip of the root. You might need a different antibiotic to kill the remaining bacteria.I'm not sure what you mean by the root canal not taking. If you still have pain, return to the dentist to have it checked. ...Read more

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Had a root canal on #12 which also has a periodical abscess. I'm on day 2 of antibiotics. The abscess has doubled in size and i feel like I have a sinus infection. Will this go eventually go down?

Had a root canal on #12 which also has a periodical abscess.  I'm on day 2 of antibiotics.  The abscess has doubled in size and i feel like I have a sinus infection.  Will this go eventually go down?

Periodontal Abcess: Call the dds who performed the root canal immediately so that he can examine you. If you also have a periodontal abcess, you may have a combined perio-endo lesion, which can exaggerate the symptoms usually seen with any abcess. The end of the root of tooth #12 is near the sinus above the roots of the teeth, which may make it feel like you have a sinus infection. Continue to take the antibiotics. ...Read more

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Will swelling on my palette go down with antibiotics? I had root canal on tuesday. Buccal infection cleared up but this tender swelling has appeared

Will swelling on my palette go down with antibiotics? I had root canal on tuesday. Buccal infection cleared up but this tender swelling has appeared

It might: But the doctor that is treating you for this root canal therapy needs to evaluate the situation. You are currently under his/her care and they know that tooth better than anyone on the internet. Feel better soon... ...Read more

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Dr. John Leander Po
1,120 doctors shared insights

Antibiotic (Definition)

An antibiotic is a medicine that slows, stops, or kills germs. The germs are usually bacteria causing an infection in a person, so the person uses antibiotics to help his body get ...Read more


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Dr. Jane van Dis
Board Certified, Obstetrics and Gynecology
12 years in practice
43M people helped
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