I am a former patient who due to a root canal that became infected, not long after it was done. This dentist insisted it was not the tooth he had done so after 9 months of the poison spreading thru my whole body, it infected even my lungs. In the old day people died from things like this. Long to short after finding a good dentist and losing the tooth I got better within a week. What I went thru between that time is another story. This tooth infected my sinuses' and dropped into my lungs I was treated for a disease I did not have and you would die from because the symptoms resembled the ones from the infection this tooth caused. My new dentist saved my life and saw what was wrong on the first visit. This should not happen in this day and age and someone should not be so arrogant to not think they could have caused a problem such as this. Almost a year of my life I thought I was going to die, this is how ill I became. Hope no one ever has to experience something like this again. Good Luck!