It's a battlefield in your mouth. Everything is after the health of your teeth, it seems. But take heart: In what it claims will protect tooth enamel from acid attacks in everyday food and drinks, Crest is giving away samples of Crest Pro-Health Enamel Shield Toothpaste.

Crest also sells a toothbrush and rinse designed to protect your teeth's enamel.

Just fill out a short online survey to get the free sample, which should arrive in four weeks.

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