H.B.
with some habits, the bigger deal you make of it, the more glamorized and sought after your young child may be to continue doing it. i definitely agree to investigate into it, but she's 4- i doubt you're likely to get a logical reason out of her. LOL! studies have shown this doesnt cause buck-teeth, so no need to start putting money into a savings account for braces. its likely she'll stop just as sporadically as she started. :D best of luck!!!!