Whenever a variable inside my GUI.Box has something subtracted from it, a new GUI.Box is created under the original, with the new value, how do i make it so that the variable inside the initial box changes? My code is below.

pragma strict

ar playerHealth : int; var playerCurrentHealth : System.String; var damageTaken : float; public var tookDamage : boolean; public var allowMovement : boolean = true; var isDead : boolean; var consumableSelected : boolean;

function Start () { consumableSelected = true; playerHealth = 100; damageTaken = 0; tookDamage = false; allowMovement = true; isDead = false; }

function Update () {

 if(tookDamage){
     playerHealth = playerHealth - damageTaken;
     tookDamage = false;
     WaitForSeconds(1);
 }
 if(playerHealth < 0 ){
     allowMovement = false;
     isDead = true;
 } else if (playerHealth == 0){
     allowMovement = false;
     isDead = true;
 } else {
     allowMovement = true;
     isDead = false;
 }
 
 if(isDead){
     rigidbody.constraints = RigidbodyConstraints.None;
 }

 if(consumableSelected) {
     if(Input.GetMouseButtonDown(1)){
         playerHealth = playerHealth + 25;
     }
 }

 

}

function OnTriggerEnter (c : Collider) { if (c.CompareTag("box o pain")) { tookDamage = true; damageTaken = 20; } }

function OnGUI () { GUI.Box (Rect (20, 10, 100, 20), "Health = " + playerHealth);

}