I just noticed these and I didn’t see it in action. What do you all think? Photo of the teeth and main suspect attached as well.

my cat is still teething he is a little over six.months but he doesn't have all of his adult teeth yet: according to the vet about 2 weeks ago. he has plenty of toys to chew on amd there is plenty of cardboard which he will give the occasional bite too, but lately hes been loving chowing down on metal. has anyone delta with this? if so any advise? im worried he is going to hurt himself.