To prepare for a root canal, it is incredibly important to follow your dentist’s instructions. Some general tips you can follow to help you be as prepared as possible include: Avoiding alcohol and tobacco for a full 24 hours before the procedure.Eating a couple of hours before the procedure if allowed by your dentist. Take a painkiller (ibuprofen or acetaminophen) a couple hours before the treatment starts to reduce swelling. Ask your dentist questions so you fully understand what is going to happen. Get a full night’s sleep before and after the procedure to help with the initial recovery process.