前歯

1. Origins, structure, and basic meaning

• Structure: 前歯, read まえば, means a tooth or teeth at the front of the mouth.
• Basic usage: In 転んだ拍子に前歯を少し欠いた。, a front tooth is chipped in a fall.

2. Common pitfalls and similar expressions

• One tooth or several
  • 前歯 does not itself mark singular or plural, so the number comes from context. 前歯の間 refers to the space between front teeth and therefore uses the plural teeth in English.