Which ingredient is commonly found in carbamide peroxide bleaching solutions?

Carbamide peroxide is commonly used in dental bleaching solutions due to its ability to effectively whiten teeth. The key ingredient in carbamide peroxide is urea, which is a nitrogen-containing compound. The presence of urea allows carbamide peroxide to produce hydrogen peroxide when it breaks down, enabling the bleaching effect on the teeth.

In the context of this question, urea is essential as it plays a fundamental role in the chemical reaction that leads to teeth whitening. When carbamide peroxide is applied, it releases hydrogen peroxide slowly, making it an efficient and effective whitening agent. This gradual release also helps to minimize sensitivity, which can be a concern with dental bleaching treatments.

Understanding the role of urea in this process highlights the significance of this ingredient in producing effective bleaching solutions, distinguishing it from the other options listed, which do not directly contribute to the active whitening component found in carbamide peroxide.