Vanity and also greedy dentists. Some dentists will often agree to a veneer procedure when in a lot of cases a basic bleach whitening of the teeth is all that's needed.
Always get a second opinion when doing anything cosmetic with your teeth.
Very true. Especially in the US where I can imagine there are lots of unscrupulous, greedy dentists only too willing to tap into the insecurities and vanity of their patients...
My friend had the invisalign braces and their teeth whitened even though they already had straight, white teeth. I think with him though it's purely vanity. He has recently started dying his hair as well
Like I said, sad.