chew necklaces, helpful or harmful?

Ri

I myself have a necklace for chewing on. I have had this nasty chewing habit since I was ten. I always needed something to chew on with my molars. One of my wisdom teeth has been poking trough since then and the only way for me to remove the ache was to chew on something. Btw I am 20 years old. I know they have these for infants, but do you guys think it is helpful to have stuff like this for older kids and even adults. also would you let you child use one?

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