Aphthae

 

It is finally breakfast time. You take the sandwich from your satchel, unwrap one end, ‘will it be ham? Will it be cheese?… Great! It is tuna fish’, you grab it with both hands, open your mouth, and… Ow! With your first bite your teeth also caught half a cheek. As well as it being terribly painful, you know that you will end up with a good sore that will bother you for a few days.