Yes! Of course, it's not the end of the world if you go to bed one evening without taking your makeup off. But otherwise, makeup removal is as beneficial to your skin as brushing is to your teeth! Actually, to be precise, we should talk about "makeup removal and cleansing". Indeed, in the evening, makeup removal frees your skin not only of makeup but also of pollution, dust and impurities that have built up during the day. It is a bit like taking a mask off to find the purity of your face again. It dissolves stress and eliminates fatigue. In any case, never apply a beauty treatment without removing your makeup, morning or evening. It won't work at its full potential: your skin will be full of built-up dust and impurities and the active ingredients will not be as effective.
What would happen if you didn't remove your makeup on a regular basis? Your skin would slowly become "dirty". Your complexion would end up becoming dull and spots could begin to form. Moreover, you can transform a sad, dull complexion by simply making twice-a-day cleansing a regular habit.