Often appears as 露齿一笑 (lùchǐ yí xiào, 'a teeth-baring smile' = grin) or 露齿微笑 (lùchǐ wēixiào, 'open-mouthed smile').
mistakes
Also pronounced lòuchǐ in colloquial speech (CC-CEDICT lists both). The lù reading is the formal/standard one; lòu is informal — same pattern as 露 in 露面 vs 露马脚.
