A few questions actually. 1. How does the one for teething even work? Do you just put it around baby's neck and leave it there? Is it safe to leave her alone wearing it? Will it break? For those that have used one, does it really work any better than teething powders/gels/toys? 2. The nursing necklace, does it work? I have problems keeping LO from getting distracted while she eats. She seems to like playing with my bra strap, pulling it back far as she can then snapping it back on me. She also likes to get a handful of boob and dig her nails into it leading to me shouting OUCH and her crying =( Has anyone used one, what do you think of it? Can anyone recommend a good site to buy them from?