Tooth adjustment will not effect the SOUND of your voice. However, what may change is how you pronounce certain words. When I had braces, my teeth moved all over the place and I noticed the change in how I said words. For instance, something as simple as whistling took on a whole new dimention. Since I learned how to whistle with the sructure of the mouth like it was, I had to relearn once everything moved. Also, if you notice that folks with braces talk a bit strange, this is because of the extra metal in the mouth, but also do to the movement. Your tounge and lips get accustom to this position of the teeth and jaw. It is how your body naturally wanted to grow. After a lifetime of this, any change in that will change other things. However, the timbre of the voice should not be changed.
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