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Is it grammatically correct? I didn't get the "when kissing" part. Is it the shortened form of "when she kisses"?

▪ Her face when kissing betrays the truth!

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Hasibrahman Is it the shortened form of "when she kisses"?

I would not call it a shortened form, but yes.

HasibrahmanIs it the shortened form of "when she kisses"?▪ Her face when kissing betrays the truth!

I'm not so sure. The gerund-participle "kissing" may refer to the action of "kissing" in which 'they/we', i.e., she and other person, could be involved.