Flat Normal on one mesh

Hello, I’m new here and request your help please! :slight_smile:

I’m doing my first character in blender. I’m actually testing baking normal from a hi-res to low-res, it is working on every meshes but not in one. I checked here and on the web and I can’t see where is my mistake so I’m posting my .blend.

The problem is with “dentinf” and “DentInfLP”: it bakes flat blue.

the blend file is pretty heavy, sorry :frowning: :

Thank you if you can spare time to help me! =)

Sorry for my english ™

EDIT: Noob mistake érestrict renderability was checked -_-’