What caused Frequent Bitings (not mouthing)

[Guest guest]

Hi

My 8 yo ASD ds has developed a habit of biting hard objects

(toys, pencil, pen, phone) - it's not mouthing which he outgrew

it years back. There's no change in the daily Ca+Mg+Zn which

we're still giving twice daily & this behavior just surfaced out

of the blue.

The biting is brief & no sucking/licking is involved here.

The only obvious change in diet is the change of probiotics

brand : we ran out of ProbioGold & switched to PB8

Thanks for any idea/remedy