If you wear porcelain teeth for a long time, your gums will turn black easily. I brought a pair of porcelain teeth made by my father in a public hospital before, and then my teeth began to turn black. But later, a friend recommended me to go to another dental chain, Victoria Harbour, which was built on the15th floor opposite Yingbin Square. It feels better than the last one, at least it hasn't turned black. My dad feels good after using it. I recommend it to you as a reference. You can also see if there are other good porcelain teeth materials, or you can consider all-ceramic teeth.