Dental Extraction Pain Remedies

I read years ago that if you drink LOTS of pineapple juice (like a can a day) and take extra A&D prior to having dental work like a root canal there would be no swelling or issues. I followed this and have taken an hour off from work for a root canal and came back to work with no issues (as a teacher! ). I know it is best not to have to have these procedures but sometimes it happens!