I would like to import a dental scan obj file. When the file is opened in windows 3d print viewer the tissue and tooth colours are visible. When you import into blender, the colours do not show up. This may be a simple setting? Here is a photo of windows Print 3d Viewer.
.obj format specification doesn't contain any description of vertex color attributes. Some software like MeshLab or Agisoft Metashape extend the .obj format and include the vertex colors after the coordinates.
v 3.112696 -9.640543 15.350909 0.592157 0.517647 0.537255
Since it is not covered by the specification, Blender provides no ability to import vertex colors. There are other formats that do allow to store vertex color which can be imported into Blender, for example