hazelwood necklaces

In one of the other posts someone mentioned using a hazelwood necklace for teething. I was wondering if any else had and had any success with it. My son isn't sleeping very well at night because of his teeth and i'm willing to try anything that might help.

We're using an amber necklace and it seems to be helping. I know another mommy on here who uses the hazelwood for her son who has reflux and it seemed to help. She said that it also supposed to help with teething, but I don't think he has any teeth coming through yet