You have two levers working in your jaws!
When you bite using your front teeth, such
as munching a bite out of an apple, your
lower jaw acts as a third class lever.
When you crunch on the apple with your
molars, your lower jaw now acts as a
second class lever.
Because your upper jaw is part of your skull which is connected to your spine and your lower jaw is connected to your upper jaw by a hinge type joint that allows you to move your lower jaw so that we can eat. So therefore we cannot move our upper jaw because that would require moving our head which would move our lower jaw too.
Upper jaw is a maxilla, and the lower jaw is a mandible.
Flex-ion and extension at temporo-mandibular joint. Here powerful Massetor and Temporalis muscles, one on either side is used. And medial to lateral or side to side movement (Grinding movement.) to grind the food. For which medial and lateral Pterigoid muscles are used.
There are fourteen bones that make up the face of the skull. We can feel and see the outline of only a few of these bones. These bones include the zygomatic bones (cheekbones), the nasal bones of the bridge of the nose, the maxilla (upper jaw), and the mandible (lower jaw).
If you were able to type that without falling on the ground in excruciating pain your jaw IS NOT BROKEN. A broken jaw hurts horribly, and you would know right away because you wouldn't be able to talk, move your mouth, or stop crying out for your mom in pain.
2nd class Lever
1st class lever3rd class lever
A lever jaw wrench is one with an adjustable jaw.
The jaw can be considered a type of lever, specifically a class 3 lever, because the effort force (muscles) is located between the fulcrum (jaw joint) and the load (food being bitten). This arrangement allows for increased speed and range of motion when chewing.
A tooth is not a lever. A tooth could be part of the lever formed by the jaw. A tooth could be a wedge.
When you chew your food, your jaw acts like a lever, which is a type of simple machine. The jaw functions as a first-class lever, with the hinge acting as the fulcrum and the muscles exerting force on one end while the food is crushed at the other. This mechanical advantage allows for effective grinding and breaking down of food for digestion.
Wedge
jaw cancer is a type of jaw sickness.
The human jaw is a class 3 lever, where the effort is applied between the load and the fulcrum. The masseter muscles provide the effort, the teeth and temporomandibular joint act as the fulcrum, and the load is the resistance of the food being chewed.
lock and key is the lever of second type
A dustpan is a 2nd class lever
The jaws act as a lever, multiplying the jaw muscle forces, similar to nut crackers.