Idk why, But whenever im sitting down Ill like chew on whatever is near me no matter how dirty it is, Example I was watching tv and the Converter caught my eye, My sister made a joke saying I might be teething But I doupt it, Is that a normal thing to do? D:
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It's the same psychological principle that is said to drive heavy smokers and over-eaters. Look up Freud's stages of psychosexual developement.
It's normal. I'd suggest that you keep plastic straws or sugar free gum on you so you won't be tempted to chew on anything too gross.
I find it frustratingly lacking in objectivity and it gets on my nerves as much as those art historians calling everything cylindrical symbolic of a phallus. He connects a lot of dots which could easily be rearranged and given just as much credibility, but would remain just as hypothetical.
Much of his work in psychosexual development has since been criticised as unlikely and improbable, and the 'oral stage' is one such example.
To do it all the time, even on a full stomach, seems unusual. Habits like this are often an expression of anxiety; biting nails, chewing on skin, rocking back and forth, scratching etc. Perhaps you feel the need to chew things because you find the sensation comforting, and therefore without chewing you remain anxious?
That's only one suggestion mind you. If it's worrying you the best way would be to seek counselling - that way you can find out if it is indeed a habit formed because of anxiety or something else.