Agnipurana 341.10

341.10

kiñcillakṣitadantāgraṃ hasitaṃ phullalocanam /
vihasitaṃ sasvanaṃ syājjihmopahasitantu tat //

with the tips of the teeth slightly visible and the eyes blossoming, it is gentle laughter (hasita); / vihasita is accompanied by sound, while mocking laughter (upahasita) is crooked;