This is what sisters are for!

Khloe Kardashian just posted one hilarious video of her sister Kourtney Kardashian at lunch after visiting the dentist ... and her entire mouth is numb!

"I have never laughed so hard @kourtneykardash," Khloe tweeted on Wednesday, along with the video of Kourt trying to hide her crooked mouth. 

The mother-of-two did seem mildly embarrassed, as she tried to hide behind a napkin, once realizing Khloe was filming their conversation for her Keek fans. 

In Kourtney's defense, we've all been there! Leaving the dentist with a numb mouth is the worst -- but her facial expression is too funny!

What do you think of the video? Tell toofab in the comment section below, and check out Kourtney (on better days) with her cute kids below! 

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