The surfaces able to be colored should be the Buccal, Lingual, Incisal(for anterior teeth) and Occlusal(for posterior teeth), mesial and distal surfaces. Information about the positioning of these is easy to find on google and as I am a dental student any questions can be addressed to myself also.
Additionally it should be possible to hide teeth from view (in the case that they have been extracted), and for extra credit it should be possible to colour the root canal or to replace the root with a screw to signify an implant or to hide the root entirely with out hiding the crown of the tooth.
Here is the sample
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