I had the experience of getting a night guard, and instructions to add a few drops of mouth wash after cleaning in the morning, while the guard is in water during the day.
Listerine was suggested due to the alcohol content.

Every day I found it harder and harder to do the care, finally it dawned on me that this brand was what my parents used and alcohol, cigarette smoke a stale unpleasent smell was linked to the product usually in the morning in the air in the bathroom. Days when houses had one bathroom.

After telling my T that I noticed this and learned, that smell and memory is closely linked and something to due with brain / nerve structure.

I went home and checked and now the listerine smells just like listerine!

My favorite scent is rose- takes me to a beautiful garden.... back now.

I also think the increased sense is a sign post of getting better. Just like when my color vision was blunted for me at my worst depression, I sure that smell would have been blunted if I cared or if I noticed- maybe the loss of appetite.