Sorry I cannot type Chinese in my office coz I am in the UK.
The problem as you mentioned above; it is because the relationship between the upper lip line and the front teeth.
(1) The upper lip line: If ur upper lip line is too high and hypermobile, it tends to show more gum while u are smiling. It is called "gummy smile".
(2) The upper fromt teeth: As u mentioned, ur upper front teeth were quite prominent and sticking out at the begining. The inclination of those front teeeh were more hrozontal than vertical. So during the treatment, the orthodontist will bring ur front teeth backwards and change the inclination. It means the inclination of fron teeth will become more vertical than horizontal in the end of treatment. It wwill make ur teeth look longer.
However, there is still some complex method to correct ur problem but as I said, it is "complex" and "sophisticated". I would not disscuss too much in detail here.
Hope I have answered ur question. If u prefer me to answer these in Chinese, I would translate that at some stage.
