Hi, I've had masses of dental work done - fillings, crowns, bridges and root canal work. I can assure you that while it isn't the most pleasant thing to have done it is quite painless. You will feel the injection but after that you should be fine. I have also had a couple of teeth out (one due to a dentist's negligence) and that does make your face ache afterwards. Just don't take aspirin after dental treatment as it increases bleeding (that's after an extraction, you don't have to worry about a filling). I am an older generation Brit and my teeth have always been weak. Younger Brits generally have good teeth!! lol 
baby!
