Have you ever had a little piece of food stuck between your teeth that nothing seems to get out? You floss, brush, swish, and try every trick you can think of.
My coworker had a popcorn kernel stuck between hers. It got so painful that she finally went to the dentist. He told her that, next time, she should tie a knot in her dental floss. It gives something more to grab onto and gets the food out more easily.
I just had something caught between mine a few minutes ago. Gave the hint a try and got it out! It actually works.
Remember this, if you ever had the occasion to use it!
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Cats know what we feel. They don't care, but they know.