Can I add small pieces of chicken neck to JD's canned food diet?

[hazelrunpack]

JD evidently had a bad start in life--his teeth are already discolored and two of his incisors were removed last month because they were loose. He's probably about a year and a couple months old. Would it help to add some chicken neck to his diet to give him something harder to gnaw on? And if so, how much can I add without screwing up the nutrition mix? Right now he's on canned food--a mix of varieties from Merrick and Blue. At some point, I may look into switching him over to raw entirely, but I need to research it for a while longer before I'm comfortable with it. And I've found nothing about whether bone can be added this way to a canned diet...so I thought I'd ask for some opinions.