Waiting on a call back from on call ped but my 9 month old was sitting w me folding laundry and I…

Waiting on a call back from on call ped but my 9 month old was sitting w me folding laundry and I guess his dad left a pen attached to his work pants and it busted, and he found it and took it behind my back and was putting it in his mouth. Didn’t pay him no mind cause my living room is always clean and child proofed so I didnt think anything of him sitting behind me . Anyone know if this is dangerous to him?