For $10, get them their own!
I still have mine till this day. I did bite on mine but not because of kiddy habit or I was a chewer but because I placed them exactly at the same spot each time for the perfect sound and not screech. And it’s where my teeth would rest on it. So there are The two teeth spots on each side where my teeth were and if I feel that dent there, I know it will sound perfect for my concert.

I wouldn’t want my sister to mess with those tooth marks.
And yes, didn’t wash it ever either because it will ruin my stickers! Maybe use the cleaning stick that it comes with when it smells or I have too much spit in it. Hate it too when my friends or sister blow on my recorder without asking and leave their spit in there! So I will not share.
It sounds yucky right? Exactly. so that’s why each kid of mine has one of their own. It’s $10. They can bite, draw or sticker it or do whatever they want with it. I think one of my kids has drawn something in permanent marker all over it. It’s an “expression over music” 😂
So buy them one each OP. Please.