wedge
Front teeth can be considered a type of wedge, which is a simple machine. Wedges are used to separate or cut objects, and front teeth, particularly incisors, are shaped to slice through food. Their sharp edges help in biting and cutting, making them effective tools for initial food preparation in the mouth.
fasten?
pulley
A pulley.
lever
simple machines are used by being pulled or pushed
because they are very important to the world and we use them everyday such as a wheel and axle that are used on doorknobs.
A winch.
Wool
washing machine
True, a pulley is considered a simple machine. It is used to lift or move objects by changing the direction or magnitude of the force applied.
There are many simple machines used in the home. One is the toaster. I could name more but the question only asked for one machine.