HESI A2 Grammar Practice Test

The term "tooths" is incorrect in this context because it is the wrong plural form of "tooth." The correct plural of "tooth" is "teeth." In English, irregular nouns like "tooth" often have unique plural forms that do not simply follow the standard rule of adding "s" or "es." Therefore, in this sentence, "tooths" should be replaced with "teeth" to convey the intended meaning properly. The other words in the sentence—"mocked out," "his," and "ten of"—are used appropriately, and do not present any grammatical issues.