[2] When a couple has received a dispensation, the partners may validate the marriage by a simple renewal of consent according to canonical form as a new act of the will.
[6] A bishop can give a dispensation to an impediment, giving the marriage retroactive validation called radical sanation or sanatio in radice (Latin: "healing in the root").
[10] The sanatio validates a marriage by reason of a consent formerly given, but ineffective because of an impediment.
[10] When the impediment is removed or dispensed, the consent is ipso facto ratified and no renovation is required.
Woestman, Canon Law of the Sacraments for Parish Ministry, Ottawa 2007.