Backed by an integrated ?marketing campaign, Church & Dwight has launched Crest SpinBrush Sonic a battery-powered toothbrush the company is touting as?an economical alternative to other higher-priced sonic models. The campaign, developed by Colangelo Synergy Marketing, includes broadcast, print, digital and direct response. The redesigned Web site, at www.spinbrush.com, comes with an animated demonstration on how to effectively use the new brush. Once on site, visitors can download ?a $3 coupon toward the brush and can opt in ?for e-mails for updates on product offers.?