Mouth

Mouth entrance to the digestive and respiratory tracts. The mouth, or oral cavity, is ordinarily a simple opening in lower animals; in vertebrates it is a more complex structure. In humans, the mouth is defined in front and at the sides by the lips, jawbone, teeth, and gums; in the rear it merges with the throat. The roof of the mouth is composed of the hard and soft palates and the floor of the mouth is formed by the tongue, a muscular structure that contains the organs of taste (taste buds).

Tongue sore and raw

A sore or painful tongue is usually caused by something obvious and visible, although there are a few less obvious causes you should be aware of that may need treating.
If the pain is persistent and you haven't accidentally bitten or burnt your tongue, see your GP or dentist. There may be an underlying infection or deficiency that needs treating, and your GP or dentist may be able to advise on pain relief while you wait for it to get better.