There's nothing you can do to make him stop except stop leaving those types of things where he can get at them. And yes, it's definitely a health concern as it can cause his digestive system to get blocked up, which would result in surgery to correct. I'd suggest some kitty proofing....put away the things you know he likes to chew on.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...