I am very unhappy with the dentist doing my implant retained dentures. There have been a number of issues, and he does not listen when I feel there is a problem. On my last 2 visits, I told him that the front left screw (I still have temp denture) hurt and occasionally bleed. The screw came out. After a 360 X-ray, they told me that another one of the screws is also going to fall out. He wants to put in more screws (at additional cost). Where can I get a second opinion?