I hate that trend, but the reverse is sometimes even more infuriating. No, medieval peasants didn't look like dirty, sickness ridden pigs covered in mud and horseshit!
They looked lile normal people without makeup. If they got dirt on their skin, they cleaned it up and despite not taking baths and showers all the time most people had a daily cleaning routine where they would comb their hair, clean themselves with cold water and a cloth and just generally take care of themselves. Rotten teeth did exist, but unless removed, they would often lead to death. So people did their best to avoid having them.