Does anyone know how to solve this problem?
model
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View attachment 517442
This is caused by a head morph influencing the teeth, inner mouth and tongue
First find out which morph is causing it (Dahlia head ?)
Then mark this morph as a favorite in your parameters tab
With your G3F selected chose the Geometry Editor tool
Right click in your viewport
Geometry selection > Select by > Surfaces > Teeth
Do this again for > Mouth
Do this again for > Tongue
All inner mouth parts should be selected now
Right click in your viewport
Geometry selection > Convert Selection > Convert to Vertex Selection
Right click in your viewport
Morph Editing > Clear Selected Deltas from Favorites
Deformation should be gone now
Select another tool than the Geometry Editor