An impacted tooth either has not come in when expected or a tooth that cannot erupt because it does not have room or may be coming in the.
Normally, the adult/permanent canine teeth in the upper jaw (maxilla) appear in the mouth (erupt) between the ages of 11 and 13 years. Just before this time.
An adult tooth that doesn't come in properly is "impacted." It usually happens when a tooth is stuck against another tooth, bone, or soft tissue. If it isn't bothering.