The reason why I'm asking is because in the mouth just freaks me out.
same the idea of shooting through the roof of the mouth always scared me
like the pain will be eternal cause it will be the last thing i'll feel while i'm conscious, the mouth is such an uncomfortable and sensitive place to shoot
but placing a shotgun to the side of the head can be tricky would be easier to use a handgun
but you're probably overthinking it you'll likely be dead before you can feel anything
Would it be a good idea to do above or behind the ear?
i think it's a mix of them, just look at graphs of where the brainstem is, you don't want to mess this up
but with a shotgun any aiming is really optional