Abstract: A method, kits, and devices for performing the method of immediately improving and/or restoring the mechanical integrity and material properties of thermally shrunk collagenous tissue through delivery of a non-toxic protein crosslinker to the tissue. A thermal energy device shrinks the target tissue using controlled application of thermal energy. A non-toxic protein crosslinker is injected and/or topically applied to the target tissue before, during, and/or after thermal shrinkage. A dual applicator may comprise a thermal energy probe and injection needle. The thermal energy probe may apply thermal energy to the target tissue and the injection needle may apply the non-toxic protein crosslinker to the target tissue. A kit for use in performing the method may provide various components used for applying thermal energy and applying the non-toxic protein crosslinker to the target tissue.