I experienced this company's unfair business practice...after 27 payments, the final one mysteriously was late [although sent on time] and they back charged me interest from the start of the plan. I found out from a local credit / debt lawyer that this is unethical...find your old statements and if the charges were not on those statements, they cannot 'post date' them. Good luck...I am about to start my challenges to them.
DO NOT USE THESE PEOPLE!>...write to the ADA and dentists supporting them.