Are Metal Turbos Okay to Use if I Am a Severe Nighttime Grinder?

I just began my second shot at traditional braces... During my first treatment I kept on knocking off my bottom brackets with my top front teeth during nighttime grinding (which is severe). This time around, my ortho said that I will need to have turbos put in to keep my bite open so that the molars erupt. However, I ended up with not the metal type but the white, plastic ones which make me look like a woodchuck and greatly impede my speech. Can I have metal turbos put in as a grinder?

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