JJ has been wearing his since he started teething and he is nearly 3! I can't take it off him, he looks so cute and we are so used to seeing it on him for so long! It's really hard to say whether it helps or not, because you don't know what they would have been like teething without it but I don't remember using bonjela with him at all and no sleepless nights etc. Whether it helped or not I don't know but I do know that he didn't seem to be bothered about them coming through and at one point he cut 4 at once! I think they are worth the investment!