J.B.
Hi L. :)
I sucked my finger til I was 4 years old. My parents tried everything to get me to stop! They even put cayenne pepper on my finger (thinking that would stop me) but I just washed it off the second they left the room and put my finger back in my mouth! My grandmother was eventually succesful in getting me to kick the habbit. She showed me a picture of some really crooked, messed up teeth. She told me that if I kept sucking my finger, my mouth would look like that. I didn't want to have teeth like that when I got older so I quit THAT DAY and never sucked my finger again! Maybe if you show them a picture of what their teeth could look like if they continue to suck their thumbs they will understand why it is important for them to stop. Good luck!