I've always considered these to be quite unsafe even though a good friend swears by the one her DD wears - she's never had any teething symptoms. We had a nightmare with DS teething and DD (5.5 months) has just started. After (another) day of her screaming, hardly eating, drooling etc etc I'm starting to wonder if it's worth a try. And does anyone have any links to a reputable selling site? TIA