Big open gobs

Now a nice smile is lovely, and dental hygiene is very important. And the millennium generation and younger are now like Americans in that they have better teeth than their parents, majority of people in their 20s now have pretty much perfect white teeth.
But why do some people on tv have to constantly open their mouths as wide as a basking whale and let us be able to look down their gob?? I was watching Graham Norton few weeks ago and Miley Cyrus was performing along with numerous large cutouts of herself doing various poses, many with gob open and tongue sticking out, in some you could even see her tonsils. This is disgusting.
There is a lad called ‘mr beauty’ on the today show on RTÉ 1 and he keeps his big gob open so wide all the time he reminds me of ‘Chatterer’ from Hellraiser.