SAVE $10: As of Jan. 9, the Waterpik Cordless Pulse is on sale for $39.99 at Amazon. That's a 20% discount on the list price.

Now that I’m in my 30s, I take oral carevery seriously. From whitening strips to water flossers, I’m always on the lookout for new products that are going to offer me my cleanest, whitest smile. What ...