If its future is to be brighter, teeth have to get whiter. Colgate-Palmolive will focus on the fast-growing whitening market, which is the second-largest segment in the oral care category, according to comments by CEO Ian Cook at a recent investor event. Cook noted that Colgate’s Optic White brand increased its market share in North America to 19.3% in 2Q15. But whitening isn't the only segment that makes Cook and company smile these days. Other successful innovations include Colgate M...