After clinical research demonstrates that botulinum toxin face slimming injection is relatively safe. Common clinical adverse reactions are as follows: 1, subcutaneous bruising: 3-7 days can fade on their own; 2, chewing weakness: botulinum toxin action at the nerve-muscle junction, blocking the release of acetylcholine, so that muscle relaxation, a week can be self-recovery; 3, skin unevenness: improper manipulation leads to uneven injection of botulinum toxin, resulting in unevenness. Some patients can recover on their own within a month, if more than a month, can take the method of replenishment to improve; 4, facial asymmetry: before injecting Botox should be assessed to exclude their own eating habits, chewing habits caused by asymmetry.