On the Dontdestroy object, how to make only 1 object when returning to the scene?

Question

Unity

I have DontDestroyOnLoad on the object, but when I launch others and scenes and then come back, I already have 2 objects, if I go out again and go to the scene where the object was originally, then there will be even more of them by 1. How can I to make a restriction so that no more than 1 object could exist?

Answer 1

var dd = GameObject.FindGameObjectsWithTag("DONT_DESTROY");
if (dd.Length > 1)
{
    Destroy(this.gameObject);
}