Martina McBride to sing for crest expression.

* This summer, country musician Martina McBride will use her new song "How I Feel" to bring smiles to the faces of thousands of children as she partners with Crest Nature's Expressions. Her song will be heard during television advertisements and will be a part of in-store displays. Consumers can now download her new song when they enter a Crest Nature's Expressions UPC code on Crest.com, and Crest will make a donation for each download (for a total donation of up to $25,000) to the Crest Smile Shoppes at the Boys & Girls Clubs of America.

"Crest is thrilled to partner with Martina McBride to celebrate the launch of Nature's Expressions and help bring smiles to children in need this summer," said Diane Dietz, general manager, Procter & Gamble North America Oral Care. "Martina has always enjoyed her natural surroundings and integrating these fresh tones, making her a perfect partner for this campaign. Plus, she is the mother of three so she truly understands how important it is for children to maintain healthy smiles."