The same article explained what actually works. Three ingredients, none of them peroxide. A triple action method.
PAP does the whitening — without stripping any minerals out. The enzymes from papaya and pineapple boost it, dissolving stains on the surface. And nano-hydroxyapatite — the same mineral your teeth are made of — fills the holes back in and rebuilds the surface.
Whiten, boost, rebuild. The opposite of what the peroxide did.
And here's what won me over. Your teeth stain — that's just what tea and coffee do, day after day. You shouldn't have to give any of it up. You don't. The PAP and enzymes keep lifting the colour off, and the nano-hydroxyapatite makes your teeth stronger and less sensitive the longer you use it.
So it whitens fast — and the longer you stay on it, the healthier your teeth get. White now, protected for good, while you carry on as normal.
One powder does all three. EcoBrightSmile.
After £432 down the drain I was sceptical. But one jar gets you white, and the rebuilding builds up with use — so I went for the three-jar bundle. Cheaper per jar, and still under a single dentist visit. Not excitement. Maths.