A liquid facelift has not been clearly defined, just like a mini facelift and a full facelift and all the types of facelifting. All of these terms can mean different things to different surgeons around the world. What I have been exposed to, in regards to a liquid facelift, includes using a combination of Botox and dermal fillers.
Botox can be used in certain areas of the face to allow your facial muscles to lift the face in a subtle way. When botox is applied to the eye and forehead area, you can subtly elevate the eyebrows. When Botox is used around the eyes and closer to the smiling muscles you can prevent the smiling muscles from elevating the mouth when a person smiles in such a way that the folds around the mouth will not be as prominent and crows feet also will be lessened.
Dermal fillers can be used to fill up the lost volume in the face, which can reverse the signs of aging within the face. A liquid facelift will only subtly change the face and will not be as dramatic as a facelift as it is done in the traditional way.
Another way of lifting the face through liquids is through facial fat transfer in the same way that dermal fillers can fill up the face. But facial fat transfer can be a way to more dramatically revolumize the face and reverse aging.
