Angry chinchilla wants to chew on unhealthy object

Hello, a few days ago my 6.5 month old male chinchilla managed to reach the foam filler in between the wood. I continued to place my hand where he was attempting to chew, gently moving his face away. He was evidently annoyed, barking and making interesting noises. I'd rather live with an angry, healthy chinchilla than a sick one, so I continued to place my hand on it until he eventually gave up. There were plenty of chewing sticks around the room. The next morning he was loving and playful as usual, but how can I avoid situations like this in the future?
Thank you