Mouth breathing leads to chewing food with lips apart, which becomes faster, noisier, and less efficient than with lips closed. This can lead to greater digestive problems and potential for choking due to the poor coordination between breathing, chewing, and an increase in the swallowing of air. It’s hard to breathe through the mouth when the mouth is full, thus an individual will need to choose whether to chew or to breathe. In the process of swallowing, one may also notice changes such as anterior projection of the tongue, noise, contraction of muscles that wrap around the mouth, and movements of the head. There may also be excessive production of saliva and an anterior lisp: which is a distortion of speech characterized by placing the tongue between the front teeth during sound production of /s/ and /z/.