I have a movieclip instance named tooth4 which is a white square. I've written the following function to replace it with the color square I've selected from a list below it. What I would like to know is if there is a way to rename the new instance back to tooth4 so that I can repeat this function as many times as I would like and have it replace the square with the color I choose everytime. I've finally got this program done if renaming an instance is possible!

function tth4(e:MouseEvent):void {
text_tooth.text ="4";
removeChild(tooth4);
var square = new bracketColor();
addChild(square);
square.x = 20.4;
square.y = 32.4;
}