How do i stop sucking my thumb?!

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Keeping your thumb out of your mouth should be a good start.

you have to constantly be aware of not sucking it. 99% of it is mental. Also, Sally Hansen makes a type of clear finger nail polish called 'Hard as nails' that's tastes HORRIBLE. Multiple thumb suckers I've know have tried it and it helps them stop. So just 'paint' all over your thum with the clear polish and let it dry. When your thumb slips into your mouth you'll recognize how bad it tastes.

You can buy this spray at a chemist called thumbs away or something which you spray on your thumb and tastes really bad. That way when you go to suck it it

A. Tastes like #hit
And
B. The taste reminds you if you are doing it subconsciously

Used it for biting my nails.

Grab some bitter spray from the pet store. You know, the stuff you spray on wires to keep pets from biting them. Put that on your thumb. You won't want to suck your thumb after, trust me! It will taste so bad your eyes will burn! After awhile, you'll be used to not doing it.

Use gauze to wrap it to your finger, so it is not avaiable to you. Just tell people you got a lilltle sprain.

Thumbsucking as actually a little common, including those who suck or chew on just the tip.

This just might work, try pulling it out of your mouth! You're not 2 yrs old anymore you should be way grown out of that bad habit by now!!