Now just think about what might happen to a plate of food that gets sent back with a clear message of "not good enough" and requires "more work". The business with the glasses is occurring in an enviorment lacking in malice.
I'm pretty unenlightened so to me a public health expert is a professional hypocondriac and I always compare all dirty mouth related incidents to people letting their dogs kiss them on the mouth after ole Fido just got through giving his NAD's a healthy swirl. It ain't all that bad for ya .... just a little unseemly.