Severe Face Bondage

There’s a genre of bondage activity I think of as “face bondage” that seems to focus on distorting a woman’s facial features. The exact nature of the fetish excitement is unclear to me, but I expect pain and humiliation and degradation factor into it, as well as taking away the ability to control what goes into tender orifices. This Japanese example is a fairly thorough and very representative sample of the genre:

Japanese face bondage with nose hooks and dental retractors