They sure do work I was also sceptic of it all
I got one when DS was about 10 or 11 mths old, wish I got it earlier, He hasn't had any pain relievers since having it on. He cut 8 teeth without us knowing.
Also yesterday I noticed his skin was very red and blotchy, looked awful. I then realised he didnt have his necklace on, put it back on 20 minutes later his face was perfect again