Dysplastic nevi are not actually considered cancer. Sometimes melanomas can occur within one, but rarely. The presence of dysplastic nevi are indicative of an increased risk for cancer in the future....
Normally, there is not enough room in your mouth for the wisdom teeth to come in. If you've lost some back teeth for one reason or another, the wisdon tooth can come in with no problem.
Urea is a Toxin create by the liver to get rid of Ammonia (also a toxin) so it needs to leave the body. It leaves via the left kidney and out of the body as urine.