Words cannot express how grateful I am to Dr. Der for his expertise and skill. After fabrication of a new denture and 12 appointments between 2 dentists I could not use the denture without extreme pain. Chewing was out of the question. I had near given up that without implant buttons the denture was a lost cause (as was $2500). In a matter of minutes Dr. Der balanced, adjusted and comfortably fit the denture. I can chew again - the man is nothing short of a genius with dentures!!!