Hi Lucy
I let kieran (10) suck his thumb big mistake. his teeth are awful, completely changed the shape of his mouth. he is waiting to hve a brace now. my niece (9) stil does it and she gets abcesses in her muth because of it. caused her to hve a tooth removed, 7 injections in her mouth later it still was a problem to extract.
my advice Lucy is dont let them suck their thumbs. causes nasty breath as well.
x