script doesnt work

Im working on 2018.3.12f1 and C#

Hi, I have a script and I have 2 problems... 1. If (Health == 0) doesnt work (see on image) 2. Playerprefs doesnt work (see on image) I have other scripts that both off these problems is working.

I cant upload the script image so I need to just copy and paste the text... :(

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;

public class HealthSystem : MonoBehaviour { Text text;

 public int health;

 // Start is called before the first frame update
 void Start()
 {
     text = GetComponent<Text>();
     health = PlayerPrefs.GetInt("Health");
 }

 // Update is called once per frame
 void Update()
 {
     text.text = health.ToString();

     if (health < 0)
     {
         health = 0;
     }

     if (health == 0)
     {
         CoinScript.coins -= 50;
         Debug.Log("You Died");
     }

     PlayerPrefs.SetInt("Health", health);

     if (Input.GetKeyDown(KeyCode.V))
     {
         health -= 10;
     }
 }

}