This little, lightweight, comfortable device has worked great in helping my 8 year old break the habit while sleeping.  Her thumb cannot wiggle out and find it's way to her mouth.  It is possible to stretch the Thumbuster over the thumb or to tear open the velcro, so it is improtant that the child be on board w/ wanting to quit.

Other devices that we have explored on line and from the dentist have been VERY expensive.  I think price for this product is very reasonable.  After 3 weeks she is completely done w/ thumbsucking and very proud of herself! We love it!