Problems with mesh

I have so many problems with one mesh I have to do animation on it. Could you help me?

Would be super helpful if you could send a screenshot of your topology of the object

Can I send you the link to my mesh because it has too many problems to screenshot?

Yeah that would be helpful :smiley:

https://pasteall.org/blend/d27577b9c8b14b688abdea660d501559

This mesh has many problems, but I hope I will fix it one day, with some help maybe. Now I am working on its mouth. I would like to open it normally and see teeth and tongue, but something is going on, you will see and I don’t know what is it. That is not the only problem, it’s just one I am currently working on it. If you could fix it I would be thankful. And also to see if it has more problems, because I need to do the animation exactly on this mesh. Thank you so much