Apexification is the act of stimulating root growth or closing the root tip. For example, in cases where the root tip (apex) is open, apexification may be recommended. Open root tips are often seen in teeth that have not yet fully developed or through a process called root resorption whose roots have been eroded and destroyed. If the root tip is open, root canal treatment will have complications and complexities because sealing the root canal with usual methods is difficult or not possible.