Well I got DDs after she got about 10 teeth in a couple of months - think I missed the boat with that one!! She since has had four molars come through with no problems, but she was older so I'm not sure whether she coped better because if age or the necklace. She's over two now and still wears it, is very proud of it although kids at playgroup love to grab and pull it so just be a bit careful with that. So yeah I'm not sure whether it did anything BUT I will get one for the new baby before his/ her teeth come through, can't hurt and might help!