What to expect once palatal expander is removed?

Nothing much: You might feel some "dents" in the tissue of your palate, but that goes away in a day or two. You will find it much easier to clean your teeth after eating. You might feel individual upper teeth re-adjusting themselves now that they are free of the bands.

Extra space: Since you got used to having the expander in, you will need to get used to it being removed. It will feel like there is a lot of extra space. Shouldn't take long to acclimate.

Comfort: in that the expander will not be in the way while brushing, eating, etc. You have likely noticed the improvement to your jaw structure and bite. Once the orthodontic treatment is done, expect retainers to maintain your new and wonderful smile!