There are those who swear by baltic amber and those who don't. Everyone's experience will vary but I can say that when my son was teething and wore a necklace I could tell a difference in his fussiness. I didn't put it on at night because I was worried about it and noticed an increase in fussiness. I also noticed a difference on the days that we forgot to put it on. But don't take my word for it, try one for yourself!
You can purchase a teething necklace from Amber for Babies for about $25 - $33 but all necklaces are 20% off during the month of January!