This pretty much appeared after I used the multires:
I just noticed while I was cleaning(deleting) edges after I divided the mouth:
What is this and how do I fix this?
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I can’t answer for sure myself, but since this is clearly a Blender question, it should probably be moved to the Blender forum (you’ve asked under Unity Courses). @FedPete @NP5
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Looking at it you have double geometry!
Maybe you have a previous backup, check if you can resolve your mistake there. Probably two mesh sets in the same object.
In the current stage, select all and perform a merge by distance.
Are you working on a low and high poly model?
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You are right, BH67. I’ve just moved this thread to the Blender subforum. 
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(This is what I thought Awwab_Shuaib, but I didn’t want to accidentally lead you down the wrong path! Good luck.)
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If you have it with the MultiRes still on it, Mute the modifier and examine the base geometry for doubles and such anomalies,
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Okay, good.
Sometimes students accidentally work on the low and high poly, seeing those double geometry. Glad you’ve solved the problem.
Have fun!
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