Root Canal agian!

Okay! I have been having trouble with my top next to the last molar. I go to the dentist, he says "You have an infection going on. Hum! that must be why my tooth aches. He sent me to an endodontist, ( fancy name for a root canal specialist) Luckily they have an opening that very day! I am told that I have already had a root canal done on that tooth but the dentist that did the job didn't do the whole job. To make a long story short, He fixed my problem (I hope) and sent me on my way with a prescription for antibiotics. If the infection does not go away, I may need further treatments. I hope that I will be good to go. I have a hard time remembering to take meds 4 times a day!