Salley said individuals at risk who have health insurance should contact their health care providers for testing. Those who don't, he said, should contact the state health department's hotline for a list of information by county.
Despite efforts from the state health department to inform Stein's former patients who might be at risk, some still haven't gotten the answers they're looking for.
Peggy Salyers of Kamiah, Ind., told ABC News that her husband found out about the investigation online, but when she tried to call the Colorado health department's hotline to get more information about testing, she was left waiting on hold for answers.
Salyers said that when she was living in Parker, Colo., she brought her disabled sister, Mary, to Stein in May 2000 to have her wisdom teeth removed.
Salyers said she brought Mary to see Stein after she took her to her appointment with a now-retired pediatric dentist for a cleaning.
She said the other dentist told her that Mary needed to have her wisdom teeth removed. The dentist then coordinated a same-day appointment at Stein's office so that she could perform the cleaning, and then Stein could remove Mary's teeth.
"I didn't know anything about him until she referred me to him," she said. "I was quite impressed with his service."
Salyers said Stein called a few hours after her sister's procedure to check in on her to see how she was doing, and asked to speak with her directly.
Salyers said she hasn't been able to reach anyone who can help her since she heard about Stein's allegedly unsafe practices, and still does not know who will pay for her sister's testing.
"I called the number, but apparently there's a lot of people calling that number," she said.