it means you're dieing.
haha jk umm you have an infection from some sort of bacteria.
nothing
dry skin
You've been eating Cap'n Crunch without milk.
inside your mouth is the teeth and tonisles
Try putting your onions in the refrigerator before peeling and chopping or just buy onions already chopped in the freezer section.
This is called linea Alba and it is a normal variation within the mouth. It is quite common.
Sores inside the mouth are called canker sores.
Sexual frustration.
a cleft palate refers to the palate aka the top of the inside of your mouth separating the nasal cavity and the mouth is deformed or damaged in some way
inside the snails mouth is a tongue called the radula
It's the top of the inside of your mouth.
the goblin shark has a mouth inside a mouth.