how to update score and health throughout different scenes.

     using System.Collections;
     using System.Collections.Generic;
     using UnityEngine;
     using UnityEngine.SceneManagement;
     
     public class PlayerHealth : MonoBehaviour
     {
         public static PlayerHealth Instance;
         public  int health;
         public GameObject deathEffect;
     void Awake()
         {
             if (Instance == null)
             {
                 DontDestroyOnLoad(gameObject);
                 Instance = this;
             }
             else if (Instance != this)
             {
                 Destroy(gameObject);
             }
             FindObjectOfType(typeof(Transform));
         }
         public void TakeDamage(int damage)
         {
             health -= damage;
     
             StartCoroutine(DamageAnimation());
     
             if (health <= 0)
             {
                 Die();
                
             }
         }
     
         void Die()
         {
             SceneManager.LoadScene("Game Over");
         }
         public void Damage(int dmg)
         {
             health -= dmg;
         }
     
         IEnumerator DamageAnimation()
         {
             SpriteRenderer[] srs = GetComponentsInChildren<SpriteRenderer>();
     
             for (int i = 0; i < 3; i++)
             {
                 foreach (SpriteRenderer sr in srs)
                 {
                     Color c = sr.color;
                     c.a = 0;
                     sr.color = c;
                 }
     
                 yield return new WaitForSeconds(.1f);
     
                 foreach (SpriteRenderer sr in srs)
                 {
                     Color c = sr.color;
                     c.a = 1;
                     sr.color = c;
                 }
     
                 yield return new WaitForSeconds(.1f);
             }
         }
        
     }    
     
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Enemyflip : MonoBehaviour
 {
    
     public Transform player;
 
     public bool isFlipped = false;
  
     public void LookAtPlayer()
     {
         Vector3 flipped = transform.localScale;
         flipped.z *= -1f;
 
         if (transform.position.x > player.position.x && isFlipped)
         {
             transform.localScale = flipped;
             transform.Rotate(0f, 180f, 0f);
             isFlipped = false;
            
         }
         else if (transform.position.x < player.position.x && !isFlipped)
         {
             transform.localScale = flipped;
             transform.Rotate(0f, 180f, 0f);
             isFlipped = true;
         }
         
     }
     }
 
     using System;
     using System.Collections;
     using System.Collections.Generic;
     using UnityEngine;
     using UnityEngine.UI;
     
     public class HealthBar : MonoBehaviour
     {
         
         public PlayerHealth playerHealth;
         public Slider slider;
         
         void Start()
         { 
             slider.maxValue = playerHealth.health;
             DontDestroyOnLoad(gameObject);
         }
     
         // Update is called once per frame
         void Update()
         {
             slider.value = playerHealth.health;   
         }
     
         internal void SetmaxHealth(int maxHealth)
         {
             throw new NotImplementedException();
         }
     
         internal void SetHealth(int maxHealth)
         {
             throw new NotImplementedException();
         }
       
     }
     
     using System.Collections;
     using System.Collections.Generic;
     using UnityEngine;
     using UnityEngine.UI;
     public class ScoreController : MonoBehaviour
     {
         //static ScoreController Instance;
         public  Text scoreText ;
         private  int score;
     void Start()
         {
             score = 0;
             UpdateScore();
     }
     public void AddScore(int newScorevalue)
         { 
             score += newScorevalue;
             UpdateScore();  
         }
         // Update is called once per frame
         void UpdateScore()
         {
             scoreText.text= "Score:" + score;
         }
         }
     
         public class ScoreController : MonoBehaviour
         {
          public  Text scoreText ;
             private  int score;
         void Start()
             {
                 score = 0;
                 UpdateScore();
           }
         public void AddScore(int newScorevalue)
             { 
                 score += newScorevalue;
                 UpdateScore();  
             }
             // Update is called once per frame
             void UpdateScore()
             {
                 scoreText.text= "Score:" + score;
             }
         }