I went to Dr. Chen He, an endodontist with Coast Dental, for a simple root canal. To start the Xray machine didn't work and staff had to call for tech support to get it working. Then I was in the chair for 5 hours for a root canal. Dr. He completed it, took an xray and found she hadn't gone to the end of the root so she took the filling material out and continued drilling. I was in a great deal of pain for the next few days, which didn't seem right. I went back to my dentist to have the crown installed and he took an xray to check the root canal when he heard where I went. There were gaps in the filling material in the root of my tooth and I was referred to another endodontist. He took state of the art images that showed Dr. He had drilled through the root and there was filling material extending out of my tooth and into my sinus cavity - she had even drilled into my sinuses and pushed a pile of the filling material up into it. When they removed the temp crown blood poured out and I was informed they could not save my tooth because she had compromised it. I then had to have it pulled and go through a sinus lift bone graft and implant, costing me thousands of dollars. When we contacted Coast Dental they paid part of the insurance payment back to the insurance company, but because I wouldn't sign a release of liability, they refused to return the money I had paid - which according to my insurance they over collected. We were finally put in touch with their insurance company after months of calls and then the insurance company "lost" the claim every time we called back to check the status. I just wanted to be reimbursed for the expenses she caused unnecessarily. We have never received a payment from them and have now had to go and file a small claim against them to try and recoup our losses. I would not take my dog to have it's teeth cleaned at Coast Dental. It is unconscionable that they could have such complete disregard for the welfare and satisfaction of their patients. They are not accountable and don't care.