S.B.
Hi there! Check with your son's school. I know at my son's school the occupational therapists have tools to help kids with this problem. Both my 5 yr old and my 3 yr old chew on their sleeves a lot. (my 3 year old will put almost anything in his mouth) They recently suggested to me a necklace (string or rope so it's not "jewelry" for boys) with a rubber tube they string through it so that the kids can chew on that instead of their clothes. It saves their clothes while still offering them something safer to chew on...