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...the proper adjustments...
When smiling, the teeth only should be shown. As soon as you show the gums, it spoils the good effect. When showing the gums you are doing triple harm. First, the gums never look good; second, you are making too big creases in the side of your mouth and third, your lips come too wide apart. Especially should a girl be careful not to show too abnormally big mouth.
@Gardener --- there are lots of things you don't know , yet --- just give it some time