Can I sue my dentist for having a malpractice done on my tooth?

I am and have been an established patient at a local dentist. I went in to have a spot of decay about the size of a pin head removed from one of the teeth in the front. He did a poor job on the tooth and pushed back the gum line, and I went back about ten days later and she fixed it. Once again inflicting pain and tearing up my gum line. This happened two more times and finally the gum line wouldn't come back down, even though she told me it would eventually heal. I went back yet again and she suggested I go see her associate, the owner of the practice I believe. He took pictures; he corrected the tooth, AGAIN. Tore up my gum line painfully again and said it may never come back due to "tissue damage" from the other dentists previous attempt. I have been very good keeping up with my teeth. I work in the customer service field and this is a huge blow to have a destroyed gum line in the front of my mouth, not to mention the large hole between my teeth from the pushed back gum. I am furious and they can't give me a satisfactory answer or fix to this problem.