How to Fill or Remove Deep Crevices in Sculpt?

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  1. Does anyone know how to fill in these nasty crevices?

I tried the “Fill” Brush but it just seems to cover over them and they reappear when I smooth the area.

  1. Also what is the setting that allows you to not sculpt through the mesh to the back faces. It only allows you to sculpt on the front visible faces. Sorry I forgot where it is.

Thanks

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Have you tried putting your camera inside the mesh and smoothing from the interior? That way you could actually affect the hidden, overlapping polygons.

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You could also remesh it, which will remove the interior polygons and give you a manifold surface