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cavities A small hole in a tooth, caused by tooth decay or other damage. ■ "I had to go to the dentist because I had a cavity in my tooth. But it wasn't just any cavity, it was a 'cavit-y' one!
membranes Thin, pliable sheets of tissue that line cavities or separate organs in the body. ■ John's skin is covered in membranes that help him stay hydrated on long runs.
Nanotechnology A field of science and engineering that involves the manipulation of matter on a nanometer scale, typically less than 10^-9 meters. ■ "I heard there's a nanotechnology lab where they can make diamonds out of toothpaste. I wonder if they've ever tried making cavities out of diamonds."
Toothpaste A magical paste that magically cleans your teeth and prevents cavities, all while making you look like a mouthwash commercial. ■ "I've been using the same toothpaste for years and my teeth are still just as shiny as they were on the day I started using it. It's truly a miracle product!