Fill in: mysterious,mischievous, therapeutic, infectious, transformative. 1. Smiles can be quite , causing others to smile too.
2. Studies are finaly starting to cast light on the secrets of smiling.
3. Whether it's a(n) smirk or hude grin, a smile can tell s a lot about a person.
4. A smile has such power that it can change our mood.
5. When someone is ill, smiling can offer benefits and speed up recovery.