Health,End Game Panel and Gave Over Text

I have a levelmanager that holds the player health

    [Header("Player Health")]
     public int maxHealth = 7;
     public int currentHealth = 7;

When I then created a Canvas UI Plane and Text for Game Over. and I have attached it to the levelManager.

But, when the player life gets to zero, nothing happens

 public void PlayerGameOver()
 {
     if (currentHealth <= 0) {
         GameOverText.gameObject.SetActive (true);
         Time.timeScale = 0;
         EndGame.gameObject.SetActive (true);
     }                
 }

The player currrent health does deplete in game, but never get the game over messages. Where am I going wrong?