Facial Fillers: What are they?

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If you want to plump out your thin lips, dermal fillers is the way—but it can also be used to give the eyebrows a bit of a lift, enhance cheekbones and diminish your under eye circles. So basically, it gives you a young, well-rested and rejuvenated appearance.
They can be done in less than an hour and have little to no downtime. In some people, dermal fillers may cause some mild bruising, temporary swelling, or temporary redness at the injection site. Rarely, a person might experience an allergic reaction. The major disadvantage of dermal fillers is the effects are indeed temporary. For the most part, however, the effects can last from a few months up to a year and a half.
Don't confuse dermal fillers with Botox and Dysport, which are wrinkle relaxers. While dermal fillers and wrinkle relaxers are both considered “injectables,” they are in two entirely different categories. Botox and Dysport are used to paralyze muscles and stop the motion of muscles that cause wrinkles. They are not used to fill, plump, or enhance an area. However, they can be used in conjunction with fillers.
With all the dermal fillers on the market, it can be quite confusing to determine which should be used when. In the United States, the list of available fillers is long. Below you will find an overview of those available in the U.S.
Juvéderm XC / Juvéderm Ultra XC
Main Ingredient: Hyaluronic Acid
Uses: Juvéderm Ultra is good for fine lines and not so deep wrinkles of the face. It’s also good for adding volume to facial tissue, especially wrinkles and fine lines. Juvéderm Ultra can be used closer to the surface of the skin and areas with thinner skin, such as the parentheses around the mouth and nose. 
Juvéderm Ultra XC can be injected into the lips and used for lip augmentation.
How It Works: When injected, the hyaluronic acid acts like a sponge. It absorbs water and as a result plumps up the area in which it was injected.
How Long Will It Last: Reported to last from six months to a year. Less material is usually needed for touch ups. Juvéderm Ultra XC can last up to one year.
Price: One syringe of Juvéderm Ultra or Juvéderm Ultra XC will run you about $450 to $700.
Reversal Agent? Yes. The volumetric effects of Juvéderm Ultra can be reversed with hyaluronidase.
Special Notes: The XC version of Juvéderm includes the addition of lidocaine. Lidocaine is an anesthetic that helps reduce pain with injection.
Juvéderm Voluma XC
Main Ingredient: Hyaluronic Acid
Uses: Good for adding volume and contour to the cheeks. 
How It Works: The hyalruronic acid absorbs water and augments the injected area.
How Long Will It Last: The effects of Juvéderm Voluma XC lasts about two years.
Price: One syringe of Juvéderm Voluma XC is priced around $900 to $1,400.
Reversal Agent? Yes. Hyaluronidase can be used to reverse the effects of Juvéderm Ultra.
Special Notes: The XC version of Juvéderm Voluma includes the addition of lidocaine. Lidocaine, an anesthetic, reduces the pain associated with injection.