Has anyone tried these? Dd is having a terrible time with her teeth, really grizzly and unhappy, plus she's not sleeping well which makes it all worse. I hate dosing her up with Calpol but the Nelson's homeopathis Teetha stuff only has a limited effect when she's really upset. I saw this amber necklace in a catalogue and it's supposed to have an analgesic effect and I was just wondering if it's a load of rubbish or worth a try.