Depending on the age of the person  and amount of teeth that he has, I would 
seriously consider having the tooth extracted. root canal teeth harbor bacteria 
which is not to say that many people do fine with them. But, if he is having an 
abcess, chances are, it has been building up infection for a while and this can 
eventually invade the bone. I would us the CS after the extraction to kill any 
residual infection.
       
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