I am looking for something for my oldest kid, he is 7 and will be starting 2nd grade this Fall. He is a thumb sucker and is majorly chewing/sucking the neck/collars of his clothes. We used to have chewy tubes until he lost them and he asked that I buy some more. I am looking for something that I could put on a necklace for him but does not seem babyish/toddlerish or that other kids will pick up on it being a "chew toy". Anything good out there that is less stigmatizing but is well made and durable?