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It can be very tricky to find the wisdom tooth but according to a internet resource there's a easy way to find it out. Take a look at your wisdom teeth extraction sites to observe their appearance. This may be difficult if they are the upper wisdom teeth. Take a look at each wound site. If the socket appears to be a hole and you are in extreme pain. but most of people just prefer to take it out may be you can do that too in very swear pain case.
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^ Not all wisdom teeth can be simply extracted. There's risks involved which have to be weighed up against the benefits and thats why xrays are almost always taken beforehand.
The pain can be as a result of becoming impacted or inflamed tissue around the area of the tooth while it erupts.