Quoted from TRAMD:I'm a physician and have considered putting a pin or an arcade game in my waiting room but one of my partners said no. He doesn't like any ideas he doesn't come up with.
In a doctors office sounds like a bad idea, it be a germ transfer device if people didn't sanitize and were sick or coughing sneezing on the glass.
In a dentist office I think the bells and sounds even the mechanical sounds would be a bit unnerving to some. Just my opinions.