Surgical tape? That's really not very nice, is it?  Reminds me of a friend who duct taped a mitten on to her son's hand each night...That's so invasively mean and I am sure totally ineffective, right?
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I sucked my thumb until I was 13...right around the time the turmoil of my parent's relationships ended and there seemed to be some normalcy again. Coincidence? Maybe.
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That was my reason.
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They tried ridicule, threats of horrible braces, orthodontic consults, even hot sauce, mustard nail polish and thumb spurs, all of which my cousin got.
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None of it deterred me.  I needed it to feel calm and safe.
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You may want to address the root cause if it really has to stop.
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FWIW, my orthodonist at the age of 14 said I didn't need braces BECAUSE I had sucked my thumb for so many years I had inadvertently made room for my wisdon teeth which were already pushing my weirdly spaced teeth back together.
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I now have perfectly aligned gorgeously straight teeth and I never wore braces a day in my life.
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Just saying...orthodonists are not clairvoyants (they are however, for profit doctors who generally make a fortune at what they do)...he might be fine and if he isn't it, it's his choice. Give him a time limit, tell him that if he doesn't stop within the next, say, six months, and his teeth need major reconstructuve work as a result, you are not going to pay for it. He can always wait to get braces when he is older...in fact it seems to be a new trend. I have about 15 friends and co-workers who are getting braces NOW in their lives. I also do not have a single UK friend who had braces as a child and they are perfectly well adjusted normal healthy adults with slightly crooked teeth and a heck of a lot of character.
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Definitly do not push the issue. It will only make it last longer.