Is it normal to eat with your mouth open?
Depends.It depends
It’s common for people to eat with their mouth open, but many people find it unpleasant or rude. If you’re doing it without realizing, it’s usually just a habit you can work on changing.
Sure—lots of people do it, especially when they’re distracted or never got into the habit of chewing with their mouth closed. It doesn’t mean anything is wrong with you.