From a health perspective, smiling is the same as exercise that is beneficial for maintaining health, because it can increase enthusiasm, reduce endiferin and cortisol hormones, produce endorphins and serotonin, and accelerate the healing process of diseases.
Now in terms of Public Services, the higher the level of 3S service (Smile, Greet and Greeting) will be directly proportional to consumer satisfaction, in this case BPS data users.