Jawbone shaving during wisdom tooth extraction.

I went to the dentist to have my wisdom tooth removed because my gums were swollen due to the wisdom tooth.
But they said I need to cut down the jawbone a little...
So I was scared and ran awayㅠ
I was so scared when I heard about cutting the jawbone ㅠ
It's okay to cut it, right?ㅠㅜ