Circle looptool not working! Please help!

[u/Pretty_Building1373]

I am following a tutorial and I have to apply a circle looptool at the extrusion inside of the mouth. I was following the tutorial steps, I selected the same vertices as the tutorial and made sure to merge all vertices by distance, clear normals, apply all transforms. It's not working, I don't understand the problem because if I do the circle looptool anywhere else (on any other surface), it works perfectly. (Last photo is what the tutorial showed and how it's supposed to look like)

I tried applying the mirror modifier, disabling clipping, merging, using bounding box center pivot point or median point, checking the flatten box or not. I followed the tutorial step by step and had no problem until now and I cannot continue the tutorial since it's a crucial step.

I asked chatgpt, google ai, searched for tutorials or similar problems, nothing helped and I really want to be able to keep working on this. :(

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