Baltic Amber teething necklace... do they really help?

Iy

I'm a FTM and my son is almost four months old. He's been teething for a while but just 3 days ago he started being physically in pain at night. Today was the first day he was in so much pain. I've read about the necklace but does it really work? My son eats everything so is it a choking hazard? Thank you