A toothy smile is a wide, beaming GRIN that shows off the teeth. It is often seen as a sign of joy and happiness, and is often used to express excitement or pleasure. The term 'toothy smile' can be used to describe a wide, genuine smile that reveals the teeth, and is often associated with laughter. The crossword solution for the term 'toothy smile' is GRIN, which is a four-letter word meaning to smile broadly.