However, some adult teeth do cause pain when they come through, such as the wisdom teeth that erupt or push through the gums. Teething pain can be worse if the gum becomes inflamed because of the bacteria in the mouth getting into the area, so it is very important to keep the gums around erupting teeth (whether they are baby teeth, adult teeth or wisdom teeth) as clean as possible to prevent this. When adult teeth erupt, they usually descend into the same space where the baby teeth have fallen out, so the gum is either thinner or already broken and therefore the process is normally painless. [Extracted from the article]