“…20 Although nerve-block injections are more technically difficult, and, therefore, somewhat less predictable than infiltration injections. [21][22][23][24][25][26][27] However, regardless of the type of local anesthetic used, postoperative soft-tissue anesthesia may lasts for several hours. 28,29 Following a dental appointment requiring local anesthesia of the lower teeth, patient may inadvertently bite the lower lip out associated with the unfamiliar sensation of being numb or because no pain is felt.…”