Make Health script lose health when certain animation is played?

I am trying to make my player lose health when the enemy attacks with a certain animation here is the health script i have.

 using UnityEngine;
 using System.Collections;
 
 public class Health : MonoBehaviour {
 
     private float maxHealth = 100f;
     public float curHealth = 100f;
     private float width = 150f;
     private float height = 35f;
     public GameObject Entity;
     public GUITexture HealthBar;
     // Use this for initialization
     void Start () {
         //Start of Health bar
         HealthBar.pixelInset = new Rect(Screen.width/-2.1f, Screen.height/2.25f, width, height);
 
     }
     
     // Update is called once per frame
     void Update () {
         //Percentage of health
         float per;
         per = curHealth/maxHealth;
         //New Bar Called when loss of health
         HealthBar.pixelInset = new Rect(Screen.width/-2.1f, Screen.height/2.25f,width * per, height);
 
         if (curHealth <= 0)
             curHealth = 0;
         
         if (curHealth <= 0) 
         {
             Destroy (Entity);
         }
     }
 }