Hi, and thanks for your question
As far as we know, there has never been an incidence of HIV spread this way. HIV does not live outside of the body on surface. Even if there was HIV-infected blood on a surface, the virus would die within a few seconds and would not be able to infect another person. From what you’ve told me, there is no HIV risk to you from this dental visit
Let us know if this does not answer your question or if you have any more questions or concerns.