How do you stop the habit of sucking your thumb?

Thumb sucking is such a hard habit to break but I have two options that may help with quiting sucking the thumb
1) talk to your dentist about Mavala, it tastes horrible but you have to stay on top of it because it wears off quickly which is why it did not work for us as others.
2) Which has been my luck with my daughter who was born with Tetrology of Fallot and the thumb was her comfort in the hospital and now just a problem at age 4, just place a band-aid good but light around that sucking finger. You will have to wait through the crying and trying to take it off, after a short time your child may be open to the band-aid and sometimes asking for it, and it is not traumatic just annoying and it really has been the only thing that has reduced the problem the first time around, and I say reduced because it is hard to stay on top of it. The second time I stayed on top of it and it was successful and not harmful in any way. You may notice the cost of going through band-aids but Walmart or Costco bulk boxes whatever, it was worth the second time around for us.