I went to the hospital dentist office as well. They were really nice, and although the only person who spoke English was the actual dentist, with hand motions and words like Open and Bite I was able to work great with the assistants. I didn't do anything major like cavities, but I did get a mouth splint. (It helps you not grind your teeth at night, incase this is something you need??) I got the hard plastic one and with my public school insurance I paid about 400,000 won. Which is a lot, but way cheaper than what it costs in the USA.