Using a mirror and clean hands, look and feel for lumps color changes, red or white patches, or sores.
Inspect your face and neck
Check your lips and gums by pulling them away from your teeth.
Examine your cheeks by pulling them out.
Look at the roof of your mouth with a mirror by tilting your head back.
Inspect your tongue and the floor of your mouth by moving your tongue and feeling underneath it.
Examine the back of your throat by opening your mouth wide and saying "ahh".