Can't calculate enemies health

Hello everyone !

I am very new in Unity and in order to create my sidescroller i have been getting help from the 3DBuzz tutorials.
But they do not show how to do melee damage so i have tried to combine their code with mine… which has resulted to some issues.

so i have a character which holds a sword. The sword has a box collider on it.
I have a box which i consider the enemy and have given it Health , a Health bar and also a boxcollider.

The Sword has a SimpleSlash scipt on it :

using UnityEngine;
using System.Collections;

public class SimpleSlash : Slash, ITakeDamage
{

public int Damage;

protected override void OnCollideTakeDamage(Collider2D other, ITakeDamage takeDamage)
{
takeDamage.TakeDamage(Damage, gameObject);

}
}


ITakeDamage Interface

public interface ITakeDamage
{

void TakeDamage(int damage, GameObject instigator);

}

And then i have the Enemy Class

using UnityEngine;
using System.Collections;

public class SimpleenemyAI : MonoBehaviour, ITakeDamage
{

public float speed;
public float SlashRate = 1;
public GameObject DestroyedEffect;
public int MaxHealth = 100;
private CharacterController2D _controller;
private Vector2 _direction;
private Vector2 _startPosition;
private float _canSlashIn;
public int Health { get; private set; }

(some other methods)
And

public void TakeDamage(int damage, GameObject instigator)
{

Health -= damage;

if (Health <= 0)
{
Instantiate(DestroyedEffect, transform.position, transform.rotation);
gameObject.SetActive(false);
}
}

the problem is that once the sword collides with the enemy the Enemy immediately dissapears !
I thought maybe the sword hits the target multiple times and Health goes immediately to zero… but no
I tried setting the sword damage to 0 and the same thing happens ! The enemy immediately dies/disappears !

Can you guys help me ? (sorry for posting code as text)

Solved, i am an idiot. I forgot to set the Health to max health in the beginning !