Final answer:
The permanent tooth should be replaced in the socket as soon as possible after being avulsed.
Step-by-step explanation:
The tooth that should be replaced in the socket as soon as possible after being avulsed is the permanent tooth. Primary teeth, also known as baby teeth or deciduous teeth, naturally fall out as a child grows and are eventually replaced by permanent teeth. However, when a permanent tooth is avulsed or knocked out due to trauma, it is important to seek immediate dental care to attempt to re-implant the tooth as soon as possible. The chances of successful re-implantation decrease significantly over time, so prompt action is crucial.