Patients of SPD Dental in Memphis, TN, may be at risk for H-I-V, hepatitis B, and hepatitis C.
The clinic closed July 1 after a patient complained to the Tennessee Board of Dentistry about unsanitary conditions.
Investigators later found bloody gauze on the floor, a sink covered in dirt, and evidence that Dr. Alfred Brown re-used dental crowns on patients.
Investigators are now encouraging everyone who visited the clinic to get tested.
No word yet if Dr. Brown will face criminal charges