Saxophone players and maybe clarinet players sometimes have an issue with ruining mouthpieces, by cutting through the top, as the teeth place pressure on the top. As you play the instrument the teeth are scratching, grinding, and cutting their way into the mouthpiece. In some cases causing enough damage to have to replace the mouthpiece.
I have used mouthpiece patches, an adhesive pad which is placed on top of the mouthpiece to guard against the damaging teeth. However, I find that they only last a few days. And I don’t like the little bits of rubber that get in my mouth as the pad breaks down.
I found a solution in something that athletes wear. It is called SISU Mouth Guard. It is a customizable tooth guard to protect the teeth during sports. I’ve found that they can be used as protection for my mouthpieces. By wearing this mouthguard I am able to protect my mouthpieces without getting rubber bits under my tongue and in my teeth.