Ever heard about facial exercises? do they work?

Anonymous
I was stumbling and googling looking for some info on the "perfect jawline" and some sites say we can improve our jawlines and define it with exercises! has any of you ever done these? did it give you any results?

What I am concerned about is that chewing gum exercise, I heard that chewing gum all the time can have bad effects on the face's muscles rather than improve anything, so what do you think?
Ever heard about facial exercises? do they work?
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