TULSA, Okla. – Health officials on Thursday urged an Oklahoma oral surgeon’s patients to undergo hepatitis and HIV testing, saying filthy conditions behind his office’s spiffy facade posed a threat to his 7,000 clients and made him a “menace to the public health.”

State and county health inspectors went to Dr. W. Scott Harrington’s practice after a patient with no known risk factors tested positive for both hepatitis C and the virus that causes AIDS. They found employees using dirty equipment, reusing needles and administering drugs without a license.

Harrington voluntarily gave up his license and closed his offices in Tulsa and suburban Owasso and is cooperating with investigators, said Kaitlin Snider, a spokeswoman for the Tulsa Health Department. He faces a hearing April 19 where his license could be permanently revoked.

“This is an unprecedented event,” Susan Rogers, executive director of the state Board of Dentistry, said in an interview. “To my knowledge, this has never happened before as far as a public notification of a (hepatitis C) case involving a dental office.”

The Oklahoma Board of Dentistry said the inspectors discovered multiple sterilization issues at Harrington’s offices.

Officials are sending letters to 7,000 people who are known to have been patients of Harrington, but they noted that they do not have information for patients before 2007. The letters urge the patients to be tested for hepatitis B, hepatitis C and HIV.

“It’s uncertain how long those practices have been in place,” Snider said. “He’s been practicing for 36 years.”