Botulinum toxin (Botox, Dysport, Xeomin, and Jeuveau are all different brands): "This is what's known as a neuromodulator," Samolitis

explains. "That means it binds to a specific receptor in a nerve ending that prevents the nerve from communicating with a muscle, therefore reducing the muscle activity. These products are used to reduce wrinkles that are associated with certain facial movements/expressions. This is most commonly used for areas such as the frown line between the eyebrows (aka the "elevens"), forehead lines, and crow's-feet lines. It can also be used for upper lip lines, chin dimpling, and lines in the neck.

“Newer techniques are using these products to create lift by relaxing muscles that are natural depressors in the face and neck. For example, that muscles that pull down on the brows or the jowls can be relaxed to create a very slight lifted look. Even more exciting and new uses for these products include injecting micro-droplets into the skin (instead of the muscle) to reduce oil production in pores, reduce sweating, shrink blood vessels to reduce redness/flushing, and smooth skin texture. There may even be some benefit for treating acne and rosacea, but this is still being studied.”

Fillers: These products replace volume. The most commonly used fillers are made of hyaluronic acid, which is a sugar molecule that is bound into a gel-like injectable and placed into various levels of the skin and deeper tissues to replace tissue that we have lost with aging or enhance tissue that we don't have naturally. Certain thicker fillers are used more appropriately on bone and in the fat compartment in the face to create contour (for example, volumizing and contouring the cheeks, temples, and jawline).

"Fillers that are smooth and [bouncier and more elastic] are used for smoothing and plumping lips and around the mouth where there is a lot of movement," Samolitis explains. "If a thicker filler is used in these areas or injected superficially, it can create an unnatural stiff or overly plumped look. Finally, very thin, almost watery, fillers are used to create a hydrated effect in the top layers in the skin or fill in very fine lines or acne scars."