The most common lip flip side effects are general soreness and redness at the injection sites. Bruising and swelling can also occur but are rare when a skilled dermatologist performs the procedure. Musicians who use wind instruments may want to refrain from this procedure as it will slightly weaken the lip muscle that is required to blow into the instrument. In addition, it may hinder the ability to drink out of a straw. Injecting neuromodulators requires a very high level of training. This ensures patients do not end up with asymmetrical smiles or an inability to utilize their lip muscle. These undesirable side effects gradually wear off as the Botox dissipates in the body. When done correctly, lip flip Botox provides patients with a natural result. We may recommend subtle enhancement with dermal fillers for those looking to add volume or change lip shape and definition.