Inverted dental cup，Wall-hanging teeth-cup 倒立牙杯

There is no need for support, and the number of wall layers is more than 2 layers

这个牙杯用了将近一个月的世界才搞定，用更干净的杯具洁净牙齿是更好的选择，希望这个牙杯可以保持更多健康的牙齿。