OKLAHOMA CITY, OK--(Marketwire - January 30, 2008) - On January 25, 2008, a class action lawsuit was filed in the United States District Court for the District of Massachusetts against American Dental Partners, Inc. (NASDAQ: ADPI). The complaint alleges violations of federal securities laws, Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5, including allegations of issuing a series of material misrepresentations to the market which had the effect of artificially inflating the market price. The class period is from August 10, 2005 through December 13, 2007.

Plaintiff seeks to recover damages on behalf of the Class. If you are a member of the Class as described above, you may move the Court no later than Monday, March 31, 2008, to serve as a lead plaintiff for the Class. However, in order to do so, you must meet certain legal requirements pursuant to the Private Securities Litigation Reform Act of 1995.

If you wish to discuss this action, participate in this or any other lawsuit, or have any questions or concerns regarding this notice, or preservation of your rights, please contact:

Contact Information: K. Lynn Nunn FEDERMAN & SHERWOOD 10205 North Pennsylvania Avenue Oklahoma City, OK 73120 Email to: kln@federmanlaw.com www.federmanlaw.com