I had 4 boys all awful teethers...I mean things that nightmares are made of. Then I had my daughter, eight years after my last son was born. We bought her an amber teething necklace and she started wearing it when she was about 3 months old. Teething was literally a breeze. I figured it was because she was a girl not really believing at all in the amber teething necklace. Then she broke her necklace off. I thought we are good, I am not going to buy another one since she obviously is such an easy teether. We then had literally 24 hours of hell like the old days with her brothers. We had a necklace shipped to us overnight. So yes I am a firm believer in the amber teething necklace.
Make sure if you buy one you get one that is baby safe where each bead is individually tied off.