Crest has expanded its line of gum health-focused toothpastes with Crest Gum and Sensitivity, which the Procter & Gamble-owned brand said targets the gum line to provide clinically healthier gums and fast sensitivity relief. The new formula helps prevent sensitivity by wrapping teeth in a shield of protection against hot and cold food and drink triggers such as ice cream, coffee and ice water. The technology starts working immediately by blocking tubules to provide all day protection, wh...