I am allergic to PPD and having a root canal tomorrow. PPD is the ingredient in hair dye that can cause a reaction. What type of local anesthetic is safe to use ?  Septocaine and lidocaine has been used in the past, but it has been many years since I have had to have dental work and the ppd allergy has just occurred over the past couple of months.  My endodontist said to ask my allergist and my allergist wanted to know what I have previously tolerated.  I told them that I havent had work done since the PPD allergy.
Hello and welcome to Chat Doctor forum. I would like to inform you that being allergic to para - phenylenediamine does not interfere with administration of local anesthesia. Lignocaine and Xylocaine are safe in your case. Being allergic to PPD restricts you from exposure to hair dyes, printing inks some medications which had sulfonamides. I will advise you to consult your dermatologist as well before taking any medication. I hope I answered your query. I wish you good health. Take care.