Do you actually feel the difference in skin tone brightening after the treatment?

Lately, my face looks dull overall, so I am very interested in skin tone care.

Even though I've been consistently applying whitening cosmetics, I don't really feel like my skin is improving significantly, and I'm wondering if I should get treatment at a dermatologist.

However, even within the category of tone management, there are so many types of lasers with difficult names that I don't know which one to choose. For those of you who have received treatments to brighten your skin tone, how many sessions did it take to notice a difference? I think I would be fully satisfied if it just brightened up naturally.