These long acting anesthetics are routinely used in third molar surgery to provide extended relief from surgical pain. If the anesthesia
remains the morning after the surgery it may indicate that the nerve
in the area may have been disturbed. This is a known consequence associated with the removal of the lower third molars and can result from stretching, compressing or tearing of the nerve. Stretching and compression
injuries have better prognosis for recovery, though it may take several months for full sensation to return. Thought injuries typically do not require further treatment, just monitoring. Injuries that involve transection of the nerve can be permanent. It is these types of injuries that may require further surgical treatment. No matter the cause, prolonged anesthesia, greater than a day, require follow-up by the treating surgeon.