Based on the user reviews on the Apple App Store, here are three pros and three cons for the 3M Clarity Smile app: **Pros:** 1. "Effective whitening results in just a few days, with noticeable brightening and whitening." 2. "Easy to use, with intuitive interface and guided sessions make it simple to whiten teeth." 3. "Saves time and money compared to in-office whitening treatments, with kits very affordable." **Cons:** 1. "Some users report inconsistent results, with uneven whitening or minimal results in some cases." 2. "Not as strong as in-office Whitening treatments, may not be suitable for severe staining or yellowing." 3. "Dental sensitivity is a common issue for some users, especially with prolonged use, causing discomfort." Please note that these are general summaries and may not reflect the opinions of every user.