A dentist I saw said that it is difficult to place dental implants in the far back of the mouth-especially the 2nd molar region. He said the reason is there is less bone in the far back of the mouth. Is there a way around this? Are dental implants still successfully placed in the 1st and 2nd molar areas of the mouth frequently? I have two 2nd molars on the top right and lower left that may eventually need to be replaced by implants.