Is results from KöR Whitening Deep Bleaching treatment permanent?

Whilst googling, I came across KöR Whitening Deep Bleaching. Their website says Permanent results – white teeth for your lifetime Could you please tell me if this IS permanent? I do not want to waste money on 'laser' whitening if KöR will keep my teeth white (with correct hygiene) forever. I do not drink red wine and only have one cup latte and one cup of milky tea a day, so hopefully that will not change the results. I would appreciate all of your help and advice. Thank you