Q. Hi Dr, I have a severe phobia of dentists following a bad experience when I was younger. I have two pretty deep cavities one at each side at the back top teeth, I can stick my tounge quite far into one of them and I have extremely bad breath which I’m guessing is a result of these. I have finally found the courage to go to the dentist and will go soon. I am only 25 years old and cannot bear the thought of extraction and would quite happily have root canal and crowns. I’m wondering if there are any instances where root canal cannot be used and extraction is the only option? I really don’t want to have missing teeth at 25, even if it is the back teeth! My confidence is so low, I’m so aware of my breath it’s ruining my life and as i have just graduated, I feel I cannot be a proffessional the way my teeth and breath are at the moment. Kind regards