The model is separated into four main parts to make it easier to manipulate. The four parts are the top gum, bottom gum, top teeth and bottom teeth. The image for the gum is located in the zip folder. The name of the image is 'top gum.png'. When you download the image on your computer, it may not be in the same folder location as the original 3D file. If that happens, you will need to reattach the the image file in your respective 3D Software.
In order to make the four parts into one component, follow these instructions: 1. Select all the four parts 2. Then use the Hotkeys, Ctrl and J.