I went for my mercury removal haven't got to the root canal bit yet but the dentist started drilling my root canal while I was out of it - we had discussed him saving a new tooth which looked like it may need root canal treatment but I wanted the old tooth out. When he hit the guta percha which a vega test had showed me as having problems with (not sure how much I trust the vega test) I had a huge allergic reaction and my face blew up to 3 times the size - took 4 days to go down and now over a week and a half later my body is still covered in little spots and scabs from the reaction - the dentist thinks it was the gutta percha but he has sent me for blood tests before he does the next half of my mouth he had to bring me round half way through so we'll see if the gutta percha is a problem and it was in my mouth all this time!!!