Um, no experience, but your post intrigued me... I had not heard of this before! My first thought was choking, not strangulation. The proponents claim that there's no risk of choking or strangulation or them coming loose, etc. There are plenty of testimonials on the Net for the efficacy and safety, if that's what you want to hear.
There are posts here explaining that amber needs to be heated to a temp of 185+ degrees C to get it to release volatiles, so the proposed mechanims for possible benefit seem rather unlikely.
Personally I'd save it for when she's about 7yo and she can wear it as a pretty item to show off to her friends. I wouldn't take a chance on using it on one so young. Teething isn't that bad, ime.
Thanks. I've heard enough about them (even from completely skeptical types, and I count myself as one of these) to be confident of their efficacy - that's not my concern. And if they help with the discomfort of teething, that's good enough for me.
I'm not concerned with the beads coming loose - the one I have has each bead individually knotted onto the necklace, so they can't come loose.
I also heard u can wrap it on their leg @ night if worried about it on their neck, someone said wrap a couple of times round their ankle & cover with a sock over it? might be worth a try i havent got one but thinking i will get it for my ds2 he is always suffering with teething so will be worth it even if just using in the day time?