Many things: This obviously has become a habit at your age. There are some things which you can paint on your thumb which taste horrible and may prevent you from putting you thumb back in you mouth. On children I use a loose fitting glove which works great.
Answered 3/30/2015
5.5k views
Visit your dentist: Your dentist can fabricate an appliance that is cemented onto your teeth. It will prevent you from putting your thumb into your mouth. Once the habit has been broken the appliance can be removed.
Answered 3/26/2013
5.4k views
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