If i chew gum 5-6 hours a day every day, will it help reduce face fat?

No

Explanation:

But it can make your face look thin for a certain amount of time.

Yes, it will help reduce face fat.

Explanation:

 The face and chin muscles are being exercised whenever you chew gum, which can lead to reduced face fat. especially for as long as you've mentioned in your question.

Sources: https://www.femina.in/wellness/fitness/7-easy-exercises-to-get-rid-of-a-double-chin-185998.html

antipsychotic medications are often used in combination with other medications to treat delirium, dementia, and mental health conditions, including:

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and more.