Can a natural tooth be grown right from the root for the third time?

No. Human teeth can't be regenerated. Once a tooth is formed the special group of cells that formed the tooth is lost. Dental researchers are looking at ways to actually grow new teeth from stem cells, but it will be many years in the future before that is available to dental patients. However we do have many ways to replace missing teeth including dentures, bridges, and implants (artificial tooth roots).