How to reduce the risk of developing a brain abscess

Condition analysis:
As long as the root canal was sealed, you should be all right.  Did the dentist finish the job, and the next step was a post and core and crown?  The last one third of the canal is sealed in a root canal, and then a temporary filling or permanent filling goes into the lower part of the canal.  If that has fallen out, then the canal could be filled with food debris and could cause decay and irritate the gums.  

Instructions:
Prevention: You can reduce the risk of developing a brain abscess by getting treated for infections or health problems that can cause them. Some people, including those with certain heart disorders, may receive antibiotics before dental or other procedures to help reduce the risk of infection.