So for those unaware of what I mean I sometimes see this joke about how some white people have a distinct smile, I can't add a picture but imagine the grimace emoji ( 😬 ), its basically a straight horizontal line of teeth, no upwards curve at the edge of the lips. Is there some cause to this or way to fix it? I feel like i smile well with my eyes but the lack of a normal curve to my smile takes away from it? I am overweight and trying to lose weight so maybe thats it.