After looking at the impressive Opro website I bought this as a back up to my Shock Doctor. However, could not mould it to fit and sit on my teeth. Just fell out straight away. I am sure Opro has been good for many people but for me it was useless. With my Chock Doctor Gel Max I was able to mould it so that it clicks into place and stays there with much comfort. This was possible because of the generous gel amount around the outer gum area.
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