Bool tool leaves parts after slicing How can I cut out the slice(bite) without leaving any teeths?

Select teeth
Select fish
Bool Tool - Slice
Delete the slice


I can't see any face orientation problems (shown in screenshot above)
I tried before slicing:

Deleting everything possible eg. rigs, poses, vertex groups
Ctrl+A Apply - All transforms
Shift+N Recalculate Normals


Similar problem though not solving my case: The difference boolean doesn&#39;t seem to work on a specific area
Use Boolean Modifier (instead Bool Tool) with Exact solver, plus enable Self - intersection, because those &quot;red&quot; teeth are overlapping.

... or in edit mode select all and with pivot point set to Individual Origins scale all teeth a bit so they don't overlap.

... and enable under Data Properties &gt; Normals &gt; Auto Smooth if you want to fix shading around edges.
Also I would highly suggest to use Un-Subdivide operator in edit mode, your topology is too dense. You can use Iterations up to 4 for shark and 4-6 for teeth. Result is pretty much the same with much lighter file and faster calculation. To make it smooth add Subdivision Modifier only for Shark before Boolean.