Evidently a lover of broccoli, Elmer Walter of Pennsylvania saw a need for special tableware in 1907:

The primary object of the invention is to provide a table implement, such as a knife, fork, or other device with a mirror suitably secured in the handle of the implement, so that the user of the implement may have ready at hand a mirror for the purpose of inspecting the teeth in the mouth or the mouth or other portions of the face generally, at any time desired by the user of the implement.

“Oftentimes a patron of a restaurant or cafe finds the need of a mirror to discover a substance which has become lodged in the teeth,” he writes. A mirrored knife “may be used by him or her for the purpose indicated above substantially without attracting any attention.”