May b ur getting a 3 molar . Take an X-ray n visit d dentist... vigorously brushing n salt water gargling , will help u to reduce pain

Your question was not very clear.. but as far as I can understand, it seems like you are getting a wisdom tooth. Wisdom teeth erupts between the age of 18-24 years these are last teeth to erupt in the body. Wisdom teeth also can be impacted -- they are enclosed within the soft tissue and/or the jawbone or only partially break through or erupt through the gum. Partial eruption of the wisdom teeth allows an opening for bacteria to enter around the tooth and cause an infection, which results in pain, swelling, jaw stiffness, and general illness. Partially erupted teeth are also more prone to tooth decay and gum disease, because their hard-to-reach location and awkward positioning makes brushing and flossing difficult.