I purchased this teething necklace on a recommendation from a friend. They were so right! My son wore this on his ankle when he started his first tooth at 3months and we kept it on until his last tooth at 2.5 years. We did lose a necklace here and there, but we ordered another quickly. My son was never fussy, never drooled, never had any of the teething symptoms so many have told me about. This necklace works, but please, wrap it around their ankles, not their neck, as advised by our pediatrician.