"Why teeth are so important for the posture? The skull is the heaviest part of our body and it is supported at the top, on the last cervical vertebra (atlas). To ensure that our head, which weighs on average 4 kg, remains at the top with the least expenditure of energy, Mother Nature has devised a very ingenious "bio-mechanical system of levers".
The question that we must ask is: "What or who is holding the skull on the last cervical vertebra?"
We will try to give you a picture of the situation.
Until a few decades ago people believed that the skull was simply supported by the neck muscles operated by our willingness to stand upright. Over time and with the birth of gnathology science, clinical trials have shown a functional-anatomic and physiopathological link between skull-mandible (CMD) and skull-cervical dysfunctions, aggregating various areas of the body in a single tonic-postural system: the skull-cervical-mandible joint.
In short, scientific literature, or rather some pioneers in this new sector, has started to understand the role of the mandible in the human postural system, and that consequently neck and back problems are caused by skull-cervical-mandible disorders.
Having established that, we can realize that in this bio-mechanism that keeps sustained our head on top of the first cervical vertebra, the "jaw" has a vital role in supporting the skull.
It is a matter of fact that these medical-science pioneers have managed to understand, more or less, the bio-mechanism and how to act on it with the use of a bite in order to alleviate people health problems, but they have always proceeded by trial and error without ever being able to develop a proper relationship between correct body posture, jaw and teeth."