basic information about texture

[Adorablepet]

I run voca, visualize the meshes with a pre-defined texture (obtained by fitting FLAME to an image using TF_FLAME), the video is generated.The texture_mesh.png does not seem to contain texture information about the teeth.If I need to add tooth texture to an existing video, what should I do, thanks.
video.zip

[TimoBolkart]

Teeth are to date not part of the FLAME geometry, hence there is not way of recovering teeth in form of a simple texture