> Treatment progresses it never stops or moves backwards.

Unless the episode gets buried at the bottom of the medical file. Unless treatment is "completed" because no more progress can made. Unless insurance doesn't cover it anymore. Unless one bad doctor discourages the patient from ever seeking out another doctor again. Unless the patient himself has only dim awareness, if any, of the fact that this happened and impacts their behavior on a daily basis.

Unless it really can't be fixed, no matter how hard everyone insists that in this day and age it should

Unless they're "Lost to follow-up".

Unless Unless Unless ...