Well, that audio is so bad it suggests a deep fake. I remember bleach was the preposterous agent cure, and I have seen the clip so many times, I am unsure if indeed I saw it live as it occurred which I believed I did. I suspecting I'm being gas lit here.
Not sure matters much anyway here in the big picture.
But I do wonder with the aversion others here have mentioned to UV, why it's so widely used to cure tooth fillings without much reservation on skin (gums) not normally exposed to any natural light.