Mouth Forced Wide Open for a Long Time

Contraptions (made of stainless steel maybe?) that fit onto the outside & the inside of the mouth that forces you to "Open Wide" your mouth and stay that way while the doc takes his time examining inside - are these used at times during a Doctor Physical? Has anyone had one used on their mouth? I suppose they may be more common at the dentist, if anywhere. But having one of these used seems to me like it would be extra humiliating, leaving you feeling unusually vulnerable and helpless - so it's of interest to me. Has anyone experienced this? & what are they called?

You may be referring to a lip retractor. And YES, I had one placed for an hour… to keep my mouth WIDE open… while braces were installed…

During oral surgery recently, to remove a growth. It was extremely uncomfortable. Fortunately the results were negative.