Could you explain harmful side effects to making someone fall asleep with anesthesia?

Safe anesthesia. Anesthesia carries with it several serious risks, which can include death and disability. Millions of anesthetics are delivered every year in north america alone and the margin of safety is phenomenal. A patient's risks are determined during work up and there is an asa ps classification system used to categorize patients. In-office oral surgery sedation is extremely well tolerated and safe.
Usually not. Despite some concerns raised in the professional and lay literature, there seems to be no harmful side effects when done by a professional in a controlled environment. There are some unpleasant side effect, such as nausea, which can occur because of some of the medications we use.