Veneer Smile

A "Veneer Smile" refers to an insincere or fake smile employed to convey sympathy that is meaningfully absent in their actions.
This phenomenon is commonly observed in individuals within the media, including celebrities and politicians, who often wear a façade of congeniality.
The term originates from the veneers celebrities have to give them their bright white smiles, as they, both literally and metaphorically, may use this smile to navigate social interactions without genuine emotional connection.

"They walk around with their veneer smiles acting like they care about the issues that matter", "That smile was all veneers and no substance"