Hello, dear, you need to hide your gums, open your lips at a certain angle, and expose your upper teeth in a certain proportion, but don't expose your lower teeth, and don't bleach your teeth too white to "create" a perfect smile. -American dentist's "perfect smile formula" Guangzhou Daily165438+1October 26th reported that flight attendants, salespeople, restaurant waiters and hotel waiters all cannot do without smiles, and the service industry has been pursuing smiles that can achieve the best results. People who have never met before and even have no language skills also want to use a smile as a bridge of communication. So, how to smile is the perfect smile? Recently, American dentists and researchers have introduced the so-called "perfect smile formula", which defines a smile in many details-from the size and width of each tooth to the overall radian, color and shape of the tooth and the overall width of the tooth. Hello ~! The most standard smile is to show seven teeth, hehe! The first icon on QQ expression! Exposing half a row of teeth and raising the corners of your mouth make people think you are really laughing! ! ! The etiquette in the Olympic Games is to bite chopsticks and practice a standard smile, which should be the most standard smile. But it is also possible that KFC's eight-tooth smile service shows dimples as instant smiles, and there is no need to smile without showing your teeth or showing your teeth. If it is really a heartfelt smile, that is the most standard! A professional smile is a smile with the corners of the mouth rising from the heart. I think it is the most standard smile and the most sincere and natural. Even if it is not the most standard smile, I think it is your most beautiful smile! Oil; Fuel filling; Make greater efforts