A single application (worn throughout the Bachelorette season premiere, if you're asking) showed results right away. Still, no pain, no gain — Annie reported teeth sensitivity that lasted throughout the next day. Such side effects are common and not indicative of any serious problems. The immediate whitening make these a perfect option for any last-minute events or invites, or a good choice for anyone too lazy to remember to use them daily. Annie was pleased with the ease of getting the strips on, and said the directions were easy to understand.
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Source: Elizabeth Griffin/Hearst