poor oral hygiene

• 口垢,口腔卫生不良

poor oral hygiene的用法和样例：

例句

1. A new study suggests that gum disease may result from reduced levels of a key enzyme in cells in addition to indifferent dental hygiene.
   一项新的研究提示，牙龈疾病除了口腔卫生不良以外，还可能由于细胞内一种重要酶的水平降低而发生。