I used a silver dime with my kids and grandkids...it works...my oldest son used it again when his wisdom teeth were coming..and he didn't hurt.
I know for a fact that the silver dime works. 27 years ago, my Daddy made me put one on my oldest son because he was running fever, stomach running off, swollen gums... Really bad. I'm not going to lie, I really didnt want to or really even believe it, but once he put it on him it WORKED!!!
I did not know he was teething again. I just would see his new little teeth. I swear by this!! And yes, I used in on my other child and got the same results!!
get a real silver dime and drill a small hole in the top. Run a piece of yarn thru the hole. Make the necklace short enough that the baby will not choke on it. Have baby wear necklace while teething.