Houndstooth is an abstract two-colour check design that was made by weaving two colours of wool together in a particular way. Houndstooth is most commonly seen in black and white.
Something is smooth if you can run your fingers over it and not catch or snag your fingers on the surface. A smooth surface has no bumps or imperfections. The opposite of smooth is rough.
Teeth are the hard, white things in your mouth. Most animals have teeth, but birds and insects don't. Teeth are used for biting, tearing and chewing food. Once you are about five years old, you start to lose your baby teeth, one at a time, over several years.
