I received botched dental care, and as a result I am now undergoing massive dental treatment by another dentist.

My cheek was sewn to my gum and as a result i encountered a major infection requiring the gum to be cut open. I need several root canals to save my teeth,because she drilled down to the nerve of the tooth and i am only 25 years old. I went back to the dentist who preformed the original work several times and she kept telling me I was fine, but I knew I was not. After seeking the care of a different dentist, I was told that the previous work done on me was horrible. Do I have a lawsuit against this dentist? I will max out my insurance before all the work can be complete, and I will have to wait until next year before I am completely well again, all the while living with constant pain in my mouth. I have had to miss work, turn down opportunities for traveling, and much more,j can you help?