Lindsey Vonn just showed off the dental procedure she had to undergo to get new chompers … and it’s gnarly as hell!!!

The Olympic gold medalist put drill to teeth Monday, filming the whole process … and in the video, you can see it doesn’t appear to be the most pleasant experience.

The dentist ground down Vonn’s two front teeth into little nubs … and even Lindsey had to acknowledge it’s some “pretty gross content.”

Fortunately, the doc was able to build Vonn’s teeth back up … and afterward, the 35-year-old showed the pearly whites were no worse for wear!!

Yeah … breathe again, P.K. Subban, breathe!