Wisdom teeth are the last teeth to erupt from your gum. There are usually four in total; two on the upper gum and two on the lower gum (one on each side). Wisdom teeth removal services are required when there is a problem with your wisdom teeth. The two most common problems are tooth decay and impaction. Tooth Decay Failing to care for your teeth can lead to tooth decay. This occurs when bacteria multiply and start eating away at your enamel.