An impacted tooth means that it is stuck and cannot erupt into full function. Usually, people develop this problem for wisdom teeth (third molars). Wisdom teeth, when not fully erupted, are removed since there is no real purpose for them. In addition, when stuck, these can develop painful infections among a host of other problems.
The maxillary cuspid or how others say it upper eyetooth is the second most common tooth to become impacted (not fully erupted). The cuspid tooth is a critical tooth in the dental arch and plays an important role in your bite. The cuspid teeth are known to have the longest roots of any human teeth. These are designed to be the first teeth that touch when you are closing your mouth, guiding your teeth into place for a proper bite.