臼歯

1. Origins, structure, and basic meaning

• Structure: 臼歯 is read as きゅうし and is a noun for a molar used to crush and chew food.
• Basic usage: A molar hurting appears in 臼歯が痛む, while explaining molar function appears in 臼歯の働きを説明する.

2. Common pitfalls and similar expressions

• Individual tooth and function
  • Use が痛む for pain in a tooth and の働き for its function.
• Difference from 前歯
  • 臼歯 is a back tooth for crushing food rather than a front tooth.