Classical conditioning is the same for people

Nobody trains a dog to salivate over some steak.However, when we pair an unconditioned stimulus like food with something that was previously neutral,like the sound of a bell,that neutral stimulus becomes a conditioned stimulus.And so classical conditioning was discovered.We see how this works with animals,but how does it work with humans?In exactly the same way.Let's say that one day you go to the doctor to get a shot.She says,;Don't worry, this won't hurt a bit,and then gives you the most painful shot you've ever had.A few weeks later you go to the dentist for a check-up.He starts to put a mirror in your mouth to examine your teeth,and he says, Don't worry, this won't hurt a bit.