Smile is an expression put up by an individual when amused or fantasized.
Smile is the ingredient that refreshes the innermind.
Smile confuses our friends and enemies
Smile lightens our burden.
An individual's smile eradicates anxiety and depression.
Let's help another to brighten up their mood with a smile. 
Besides the importance of smile that you have mentioned, I must c.nf.ss that you are naturally b.aut.f.l and attr.ct.v.. It is not enough to upvote your post.
Am following you, will you follow me
Sure I will.