What is the recommended number of Vitaran sessions? How many sessions is required for skin with severe internal dryness and flaking?

I am in my early 30s, and whenever winter comes, my skin gets shiny on the outside but feels tight underneath, resulting in severe internal dryness.

Lately, perhaps due to the heating, dead skin cells have been flaking off around my nose and mouth, so my makeup doesn't even last a day and starts to look patchy.

I tried changing my moisturizer, but the effect was only temporary, so while looking into skin boosters, I saw that the Vita procedure is frequently mentioned for skin regeneration and texture improvement.

I looked it up and heard that rather than stopping after just one session, many people improve their condition by getting it done several times at regular intervals.

I inquired about Rivicol last time as well, but I'm wondering which one would be a better fit for my skin.

① I am curious about the usual recommended frequency for VitaRan based on internal dryness and dead skin cells.

② I would like to know how often the treatments are spaced out and whether any more dead skin cells will come up after the procedure.

③ I am also curious about how to wash my face and moisturize on the day I receive Vitaran.

I'm asking because I'd like to make a maintenance plan before winter comes.