CBI sources said the searches were conducted after the questioning of DCI member Dr Gunaseelan Rajan, who was arrested by the agency on January 18 from Chennai.
They said the searches were spread at various locations across Chennai, Namakkal, Jabalpur, Hyderabad, Bangalore and Mangalore.
The sources said premises of three Dental Council of India members were also searched in the operation.
The agency had arrested two members of Dental Council of India--Dr Gunaseelan Rajan and Dr S Murukesan--for allegedly receiving bribe for arranging clearances from the council for allowing post-graduate courses at a private dental college.
The agency claimed to have recovered Rs 75 lakh cash from Rajan after his arrest.
CBI sources said during his questioning a big racket allegedly involving several dental surgeons came to light which resulted in today's search operation.
