Commentary for Kiddushin 48:5
ואי ריבויא הוא אפי' הכהו על ידו וצמתה וסופה לחזור נמי אלמה תניא הכהו על ידו וצמתה וסופה לחזור אין עבד יוצא בה לחירות א"כ שן ועין מאי אהני ליה
the slave is liberated on their account?<span class="x" onmousemove="('comment',' Though the bone still functions.');"><sup>9</sup></span> - 'He shall let him go free' is an amplification.<span class="x" onmousemove="('comment',' Not merely a generalization, and therefore it teaches the inclusion of bodily hurts which are not completely similar to the loss of an eye or tooth.');"><sup>10</sup></span> But if it is an amplification, even if he struck his hand and it withered, but it will ultimately heal,<span class="x" onmousemove="('comment',' Lit., 'return' - to its normal state.');"><sup>11</sup></span>
Daf Shevui to Kiddushin
The answer is that including all such injuries would render the examples of “eye and tooth” meaningless. Thus we need to negotiate between the limitations of “eye and tooth” and inclusion of something else. For a dislocated jaw, the slave goes free, but not for a temporarily hurt hand.