Every time he puts his hand in his mouth pull it out, look him square in the face and say, "please do not put your hand in your mouth." When my son started to pick his nose, everytime he tried we would pull his hand away and say "NO, go get a tissue". After a while, he got the hang of it. It took a bit. but just be consitant. Its more likely something that he doesn't really think about, so consistanly bringing it to his attention and physcally bringing his hand away will help him stop.
at 5:52 PM on Mar. 13, 2009