Thousands of patients are to be recalled for tests to see if they have been infected with blood-borne viruses which could include HIV.
NHS England said it will announce a “significant patient recall” of 22,000 people to be tested.
Blood-borne viruses include HIV, Hepatitis B and Hepatitis C.
The recall has been sparked amid concerns over a dentist who treated patients in Nottingham over a 32-year period, the Mirror newspaper reported.
The paper said the dentist, who has not been named, was suspended in June after being filmed breaching infection control standards.
Experts are said to have recommended all the dentist’s patients are screened and health chiefs will hold a news conference today.
The paper quoted a source as saying the risk of infection is low, but people must be tested.