Need help with exporting my model into unity

Hello, I need help with my exporting. Whenever i export my model it gets messed up in unity

Here’s how it looks like in blender:

Here’s how it looks like in unity:

Any help related to my problem is greatly appreciated,
Please and thank you

First of all: In what format did you export your model?

And second of all, are there any errors in Unity Console?

Providing more information also helps a lot, like including model itself.

I would be happy to help you if you provide the first and the second I said!