"Gummy smiles" refers to when a person smiles and a large portion of their gums are exposed, making the smile look gummy instead of showing mostly teeth.
Sentences with «gummy smiles»
it is definitwly a let down and I was worried we wouldnt bond but at 3 months old I'm the only one she will stop crying for and is always gives me a big gummy smile when I enter the room. (babycenter.com)