I just went through some much worry about going to the dentist also! I just went 2 weeks ago and had cavities filled. My cardio told me NOT to get the epi. He told me that it makes his heart race and he doesnt even have heart probs! When I went to the dentist he suggested the same. The only problem he told with not using the epi is that I wont be numb for long and require many shots. Boy was he right they only lasted for me about 15-20 minutes tops! I had to have 2 shots just to be numb enough to start and then 1 more during.The only good thing is at least your already numb getting more shots, so not so bad. I was hardly numb by the time I left also. So all in all thats much better than having my heart race! So Just say NO to the epi! Not really sure if you didnt have the epi if it would work good enough for a crown but I would ask the dentist. Hope this helps! Jaie