Could my language be an issue when I go for a check-up in Seoul?

Hello, friends! I'm Naran, and I'm planning to travel to Seoul early this year for a dental procedure. My English is basic, but not very good. I'm unsure whether I'll need to hire an interpreter for my appointments or if English will suffice.

Has anyone else had a dental visit outside of Mongolia? Is it possible to communicate in English at the clinic? Or are interpreter services very expensive? I know these are small details, but I'd like to find out beforehand!

Also, is it possible to discuss beforehand whether a clinic or a recent procedure offers the option to revert to my native language if needed? Any advice would be greatly appreciated. Thank you!