The parting of the mouth while applying mascara to the eyelashes is caused by the stimulation of the nerves in the brain. In particular, there are two nerves that control the movement of the eyelids and eyeball. They are located in the same part of the brain as the nerve responsible for opening and closing the jaw.
When two nerves associated with eye movement are activated, it is possible that the neighboring nerve that causes us to open our mouth is also activated.
But all this is just a theory. There is also a simpler explanation for this. It lies in the fact that when you open your mouth, the skin stretches and this helps you put on better makeup.
Source: Ferra
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