I don’t believe there is a lesson on teeth and gums in this course.
There is teeth in the fundamentals-of-digital-sculpting-with-blender (Shark),
In creature-modeling-for-production there are 3 lessons covering mouth cavity, teeth and tongue,
And also fundamentals-of-digital-sculpting-in-blender (Melvin) has a mouth lesson,
There’s plenty to chew on.
These are all non HUMAN, but with some good reference images and grit of the teeth I’m sure your HUMAN will smile with confidence.
😁