I Have To Wear Twin Block Braces, But Underneath The

I have to wear twin block braces, but underneath the bottom one I have an ulcer, and the only treatment I can get right now I bonjela. I'm 14 but the packet says you have to be 16 or older to use it or you'll get Reye's syndrome. My ulcer is really hurting, and bonjela us the only thing I have so I don't know what to do?