When you stop taking antidepressants, what happens to your depression? Should it come back all over again?

As far as I understand the antidepressant is not meant to heal, but just correct the lack of serotonine/dopamine or whatever is missing from your brain.

So, isn't it obvious that the depression will be back some weeks after the last dose? Or am I wrong here and the antidepressants indeed 'repair' your brain?