I'm really sorry, but I can't come on the day before because I need to have my teeth extracted.

extracted 是动词 extract 的过去分词形式。extract 由前缀 ex-（表示"向外"）和词根 tract（表示"拉、拖"）组成，字面意思是"向外拉出"。在医疗语境中，extract 特指"拔出（牙齿）"或"摘除（器官等）"。