According to a report by Chinese media outlet Guangming, tooth tattoos are emerging as a new trend among China’s younger generations.

Engraving symbols and images on your teeth sounds like a bad idea if you value oral health, but tooth tattoos are not quite as stupid as they sound. They are not tattooed directly on the teeth but on the surface of a crown made using 3D printing technology and then placed over the real tooth. One of the main appeals is that, unlike skin tattoos, which can’t easily be removed, tooth tattoos can be changed by simply replacing the crown. While some believe that skin tattoos are outdated and tooth tattoos are a new and cool way to express oneself, others simply opt for it when offered as a service by dental clinics. Instead of a bland crown, they can get a personalized model that makes them stand out or brings them luck.