Will the brilliant tooth whitening kit have permanent or semi permanent results?

Semi-perm: Teeth darken over time ; age. So no products will give you permanent results. As for "semi-permanent", if you mean a long-term stability of whiteness you've achieved, yes, many professional whitening gives you a stable result for a long time. It is common, however, that patients want to do periodic "touch up" whitening to maintain the whiteness they finally achieved. I do not know "brilliant" kit.