Enemy Health Help

I have this script which shows the enemy's health, but I'm going to have multiple enemy's so i dont want to the enemys health to show on my screen, can anyone help?

script:

 using UnityEngine;

using System.Collections;

public class EnemyHealth : MonoBehaviour {

 public int maxHealth = 100;

 public int curHealth = 100;

 

 public float healthBarLength;

 

 // Use this for initialization

 void Start () {

     healthBarLength = Screen.width / 2;

 }

 

 // Update is called once per frame

 void Update () {

     AddjustCurrentHealth(0);

 }

 

 void OnGUI() {

     GUI.Box(new Rect(10, 40, healthBarLength, 20), curHealth + "/" + maxHealth);

 }



 public void AddjustCurrentHealth(int adj) {

     curHealth += adj;

     

     if(curHealth < 0)

         curHealth = 0;

     

     if(curHealth > maxHealth)

         curHealth = maxHealth;

     

     if(maxHealth < 1)

         maxHealth = 1;

         

     healthBarLength = (Screen.width / 2) * (curHealth / (float)maxHealth);

 }

}