The tooth is usually removed when it is not salvageable or fractured or it cannot be restored. It is also removed when the tooth is impacted or decayed in case of wisdom teeth.

• Wisdom teeth are your third molars that erupt right at the end of your upper and lower jaws
• They are called wisdom teeth because these permanent molars erupt at your maturity age between 17-20 years
• These teeth do not help you bite or chew

• Impaction: These are the last teeth to erupt in the mouth and most often get stuck or impacted in the bone due to lack of space and are unable to erupt normally.
• Wrong Angle of Eruption: Sometimes, they tend to erupt at a wrong angle and press against other teeth triggering pain.
• Cavities: As the wisdom teeth are located so far away that it is difficult to brush and floss around them causing cavities, which are difficult to restore

• Pain behind molars which can increase with time.
• Redness, swelling, tenderness which can lead to infection
• Foul breath, bad taste can also be due to wisdom teeth
• Jaw pain and stiffness

• Wikipedia
• Indian Dental Association (IDA)