I lost some weight over few months but my face...

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In the beginning of the year i became quite fat. Then with a small change of diet, i lost weight & back to normal. But i dont know why but here's the problem. My face, its still fat like before. Could anyone please suggest me how do i fix my face now? coz ppl really use to appriciate my face before becoming fat, but now, not anymore :-( Also, one of my friend suggested me to chew on chewing gum & it will help, is that true?