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How to tell between an erupting and impacted wisdom tooth 
Know where to look in your mouth. 
Your wisdom teeth are the last molars on each row of teeth-the uppers and lowers on both sides. They are meant for grinding food.
You don't need them to chew properly, but they pop up (erupt) when your jaw grows and elongates during your late teen years. Open your mouth wide and use a penlight to see the back of your mouth.