Recent bar chewing...

[Golden_Syrian_Hammmies]

Hi everyone just some advice regarding bar chewing. I have read the sticky thread here by vectis also. Fudge recently has started chewing the bars of his cage just in the mornings sometimes it can be at 5 or later. This morning he did it there about 5/10 mins ago (its now 7.50am) I don't know why he's started all of a sudden? He is in an Alaska cafe with plenty to do, he has a good sized wheel which he uses, a large whimzee toothbrush which he does use (but recently don't think he has been using it that much). As well as getting his normal Museli mix I also give fresh veg and fruit now and again and porridge every couple of days. He gets out of his cage when he wants though he is a funny ham about coming out at night preparing to wait till I put the lights out. Though recently he has become more sociable. The only thing I can think of is that his teeth are growing which I know they continually do and he feels he has nothing to chew on? I'm running out of ideas. It's hard to listen to him bar chewing without wanting to go and get him out/distract him to stop him as I don't it to become an attention seeking habit. But I don't want him damaging his teeth and the bars of the cage :/ he does only do it for 10 mins or so but id rather he didn't. I just don't want to think he is doing it because he is bored or stressed.