I just rub my beard all the time. pull hairs out. Scratch at imperfections on my skin until I have bleeding wounds. Especially if it hurts, then I do it more. I do touch things to my lips a lot, dig my nails between my teeth and under my gum line. Scratch/scrape my teeth with my nails or smash a toothpick until it is a nub with fibers splayed everywhere. Spitting bits out all the time. I don't taste things well at all. I accidentally eat rotten food if am not vigilant. Definitely a sensory processing (seeking) behavior. It is polar opposite with my over sensitive eyes and ears.
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"You can lead a horse to water, but you still need a bullet to shoot it."