Doctor im 18yrs old and my third molar teeth is paining too much what could be the cause for it?..

Many causes: Teething, an infection, and a deep cavity are all possible causes. See a local dentist for treatment.

See Oral Surgeon: In most cases, there is not enough room for the third molars (wisdom teeth ) to properly fit in the mouth. They often get stuck partly erupted, and can get infected and / or have the gum tissue partly covering them in the way and it gets chewed up and painful. See the Oral Surgeon ASAP to get examined and find out your best treatment options. Good Luck.

Wisdom teeth: Sometimes wisdom teeth are valuable asset when healthy and properly aligned, but more often, they are misaligned and require removal. The removal of wisdom teeth is one of the most common procedures at ages 15-24. See your dentist for evaluation and x-rays.

Lots of reasons: Inflamed gums, infected gums, not enough room, malposed tooth, etc. see a Dentist for diagnosis and treatment.