Resolved AR Face Tracking keeping old objects on button click

I have an app for loading glasses. When I press a button it loads a model on the face and when I press another button it loads another one. I've tried two ways of doing it:
1) Tried switching the models on the

ARFaceManager.faceprefab

when i click a button something like

Code (CSharp):

1. arObject = (GameObject)bundle.LoadAsset(rootAssetPath) as GameObject; //bundle is a downloaded assetbundle from www request
2.                 ARFaceManager fm = ARSession.GetComponent<ARFaceManager>();
3.                 fm.facePrefab = arObject;

but the issue is that I need to hide my face in order for the new model to show, otherwise it won't

2) Tried destroying the whole

ARFaceManager

component and Add it on button click with the proper model when needed. Here the problem is that on every new button click the old model stays on the screen and it doesn't go away like in the photo.

**I should note that the prefab of the glasses contains a facePrefab that is invisible through a shader, so I could hide the unwanted parts.

What could be wrong here? I hope u understand the issues. Thanks!!

 

SOLVED: I coded it to disable and reenable the script itself and it seems to be working with the first (1) question code