What is the first area to be cleaned during mechanical polishing?

The first area to be cleaned during mechanical polishing is the gingival margins. This is important because the gingival margins are critical areas where plaque and debris can accumulate, and proper cleaning here ensures that these areas are free from potential irritants that could cause gum disease or other oral health issues. Starting with the gingival margins allows the dental assistant or hygienist to effectively remove deposits that might otherwise be missed if they were to begin polishing other surfaces first.

By focusing first on the gingival margins, it sets a foundation for thorough cleaning throughout the rest of the tooth surfaces, thus promoting overall oral health. Additionally, ensuring these areas are clean before moving onto other parts of the tooth may help in preventing the spread of bacteria to adjacent areas while polishing.