  We reconsider perturbative unitarity violation in the standard model Higgs
inflation model. We show that the Cutkosky cutting rule implied by perturbative
unitarity is fulfilled at one-loop. This is a strong indication that unitarity
is restored order by order in perturbation theory. We then resum certain
one-loop diagrams and show that the relevant dressed amplitude fulfills the
Cutkosky rule exactly. This is an example of the self-healing mechanism. The
original Higgs inflation model is thus consistent and does not require any new
physics beyond the standard model at least up to the Planck scale.
