What type of dental restoration requires caution when selecting a polishing agent?

Composite restorations require caution when selecting a polishing agent due to their unique properties and composition. Unlike amalgam and gold restorations, which are more durable and can withstand harsher polishing processes, composites are made from resin materials that can be more susceptible to scratching or damage from abrasive agents.

Using the wrong polishing agent on composite restorations can lead to a loss of the surface gloss, increased wear, or even potential damage to the restoration's integrity. It's important to use polishing agents that are specifically designed for composites to maintain their aesthetic qualities and functional lifespan.

Porcelain restorations also need careful consideration during polishing, but the context suggests composite materials are particularly sensitive to the choices made in this area, thus warranting extra caution.