Why did Odo not change his face at the end of season 4 and beginning of season 5?
At the beginning of season 5 the doctor surgically alters his appearance so he looks like a Klingon.
Why didn't they just make him look like a Human at the end of the mission? Or just leave him as a Klingon for that matter so he does not have to look like a changeling anymore.
It was his decision, but what was the reason behind it?