I went to Dr. Ruiz because I had experienced pain in a rear molar. It turned out I had a cavity in that tooth, which Dr. Ruiz filled. After filling the tooth, I was still experiencing pain, so Dr. Ruiz performed a root canal on the tooth. Today, almost a year later, that tooth still causes me some pain and sensitivity.
Also, he told me that several of my previous fillings needed to be "redone". None of these teeth were causing me any problems at the time. On one of the teeth, instead of the standard high-speed drill, he used a slower speed drill with a rough (vs. fine) bit that felt like a jack-hammer in my mouth. To make a long story short; after reworking that tooth (at my expense), and capping that tooth (at my expense), he declared that the tooth was cracked, and might need a root canal. To this day, I cannot even eat a potato chip on the right side of my mouth. I will never go to that dentist again