He flashed a toothy grin, showing pearly white teeth.
Tips
usage
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 (both are in use). The lù reading is the formal/standard one; lòu is informal - same pattern as 露 in 露面 vs 露马脚.
