This could be a real worry, if you live in Sydney, and it may well be a much larger problem than we imagine.
_http://www.smh.com.au/nsw/thousands-of-worried-patients-left-in-the-dark-about-dentists-20150702-gi3ouv.html
"Tens of thousands of patients from a Sydney dental clinic that could have infected them with HIV or hepatitis are in fear for their health and unable to access information about whether or not their dentists have put them at risk."
_http://www.smh.com.au/nsw/thousands-of-worried-patients-left-in-the-dark-about-dentists-20150702-gi3ouv.html
"Tens of thousands of patients from a Sydney dental clinic that could have infected them with HIV or hepatitis are in fear for their health and unable to access information about whether or not their dentists have put them at risk."