hope someone could answer my query.

I want to get my molar tooth extracted. I have heart murmur. So I have
to take Antibiotcs prior to extraction. Do I need to continue
antibiotics after extraction if only one tooth is extracted. under what
circumstances antibiotics are taken after extraction. My dentist
suggests that I go on a ten day course of antibiotics after the
extraction is done. I feel that it is not necessary. Also I have to do
few fillings. Is it necessary to take antibiotics prior to fillings
too.

thanks