Its the ever changing scare mongering of the toothpaste ads.
Advertising exists to make us unhappy. That is its sole function. Only when you are unhappy will you buy *this* to make your unhappiness go away.
By way of a roundabout example, I'm old enough to remember the introduction of the twin-blade razor. 'The first blade shaves you close; the second shaves you closer'. They were quite a lot dearer than the old style razors that hadn't changed significantly in 100 years, but hey, what's a couple more quid for a closer shave?
We know where that road led. Razors with three blades, razors with four blades, god help us all. Each a bit costlier than its predecessor, each promising 'a closer shave'. I just went to check prices on Boots site, a four-pack of 'Fusion Proglide' blades will cost you £11.80. Three quid a pop! Hair Carumba!
Then when I was in Goa recently, I discovered I'd left my razor at home, and bought an old-style, single bladed razor, for about 80p. Shaves absolutely perfectly. And you can get the (Gilette) blades off
ebay for about 10p apiece.
All that technology, all that scientific endeavour, and all those millions and millions spent in generating the demand for it, and the whole lot - every last smirking alpha male of it - in the inimitable words of 'Lord' Sugar, 'a load of old toot.'
That's advertising!