The verb "réitigh" (the root of "réitíonn") is more "solve" than "heal" in my experience.

Even if "réitigh" is appropriate here (I'm going to suggest waiting for others to weigh in on that), I'd make "time" definite: "an t-am."

Wait for more.

Redwolf

I think réitigh is OK here. Just because it doesn't literally mean heal doesn't mean it shouldn't be used IMO. It means "time will settle/sort out/fix all things" and I think that's close enough. We could also see "Ní leigheasann" too I suppose.

I agree with an t-am.