pearly whites       
noun [ plural ]  informal uk/ˌpɜː.li ˈwaɪts/ us/ˌpɜ˞ː.li ˈwaɪts/
 珍珠白(用于形容牙齿)
a way of referring to teeth, especially ones that are very clean and white
  He grinned, showing his pearly whites.
 Celebrities know that a good set of pearly whites is essential. 名人都知道,必须把自己的一口牙齿护理成珍珠白齿。 
 - More examples
 - It's important to floss your pearly whites.
 - An electric toothbrush can give your pearly whites more sparkle.
 - Pets should have their pearly whites cleaned once a year.