Is there a procedure to fix the gum smile?

pu1. There's one where you do each tooth, but it's too expensive, so I folded it

2018-07-12

OK

pu2. You can smile when you practice

2018-07-12

OK

pu3. I was stressed out about smiling, but my way of smiling was wrong
If you look at the crew's smile, you'll see how it works

2018-07-12

OK

pu5. Practice smiling using your lower lip muscles instead of your upper lip
I heard that you look pretty when you smile after practicing

2018-07-12

OK

pu6. That's why celebrities and airline flight attendants practice laughing a lot

2018-07-12

OK