Identity theft is NOT when someone has a copy of your ID: it's when they pretend to be you, such as to charge things, take out a loan, borrow money, etc. There is nothing criminal about this. There is also nothing legally improper about *any* service provider or vendor asking for a copy of our license--it's common for landlords to do this, for example. They are allowed to ask for and copy your license; if you are unwilling to let them do this, you may have to go to a different dentist.