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Smith is one of dr. harrington's 7,000 patients who might have been exposed to those viruses because of what's called risky practices by the doctor and his staff. >> it makes my skin crawl. it's horrifying. >> reporter: marissa's mom says dr. harrington took out her daughter's wisdom teeth in june 2011. what do you remember about getting your wisdom teeth out? >> i just thought he was a really nice guy, like there wasn't going to be any problems. obviously now i don't really feel like that. >> reporter: melissa is a nurse and understands the risk of infection is low but she's infuriat infuriat...

Public health. now some of the allegations include using expired drugs, using rusty dental equipment inside patients' mouths. this is an oral surgeon. also allowing dental assistants to administer sedation using ivs. that, authorities say, is simply never allowed. all of this started after inspectors discovered that a former patient tested positive for both hiv and hepatitis c. a subsequent test proved he was negative for hiv. however, authorities are very concerned of possible cross contamination because a lot of the patients there do suffer from some infectious diseases. so a lot of patients...

Stocks are soaring. are you happy with your 401(k) and investments? so, how do you know when it's time to take some of the profits off the table? we're going to help you decide when to sell that's today at 1 p.m. eastern. cnn's saturday morning continues right now. this is cnn "saturday morning." ahead, they say their rockets are ready, aimed right at u.s. cities now. north korea's revving up their rhetoric even more. is it time to take them at their word? plus, rusty equipment and reused needles, a dentist's dirty secrets exposed. >> that's the last thing in the world that you're going ...

Italy will get to see a very famous religious relic today on tv. the shroud of turin is usually kept out of sight in a bullet-proof, climate-controlled glass case. according to vatican radio the images have been broadcast just once before in 1973. some christians believe the shroud was jesus' burial cloth. and now to tulsa, oklahoma, where screening tests start this hour for patients who have been exposed to hiv or help pite tis at their dentist's office. about 7,000 people could be at risk. the whole thing started when investigators found horrific conditions at the dentist's office. susan c...

About hour and a half he will preside over holy saturday myself in st. peter's basilica. we're live there and will bring it in the next hour. screenings begin today for thousands of dental patients in this country, oklahoma, who may be facing a life-threatening health risk. the patients were urged to get tested for hiv and hepatitis after visiting this office in suburban tulsa. susan candiotti has more. >> reporter: not many people jump for joy when it is time to go to the dentist. colton scott now has more reasons than others to be nervous about his dentist. scott says he had his wisdom teeth...