HB 1664 -- Dental Records Sponsor: Behnen This bill requires dentists to maintain complete and adequate patient records. Records must be retained for at least five years from the date of the last professional service. Any addition or change to a patient's record made more than 48 hours after the final entry will be entered as an addendum and will specify the time; date; name of person making the addition, correction, or change; and the reason for the change. Laboratory work orders are also required to be maintained for five years.Copyright (c) Missouri House of Representatives