(1) Each dentist who is a principal partner, or officer of a firm or entity identified in any advertisement, is jointly and severally responsible for the form and content of any advertisement. This provision also shall include any licensed professional employees acting as an agent of such firm or entity.

(2) All advertisements are presumed to have been approved by the dentist named therein.

(3) A recording of every advertisement communicated by electronic media and a copy of every advertisement communicated by print media, as well as a copy of any other form of advertisement, indicating the date, place and duration of the advertisement shall be retained by the dentist for a period of two years from the last date of broadcast or publication and shall be made available to the board or its representative upon request.

(4) When placing advertising, the dentist must possess such information which, when produced, would substantiate the truthfulness of any assertion or representation of material fact made in the advertisement.