The dermal filler market has expanded dramatically over the past decade, with multiple product lines, formulations, and rheological profiles now available. Not all fillers are the same, and using the wrong product in the wrong location is one of the most common causes of filler-related complications and unsatisfactory outcomes. This guide explains the major categories and their appropriate uses.
Hyaluronic Acid Fillers
Hyaluronic acid (HA) fillers are the most commonly used category. HA is a naturally occurring substance in the skin’s extracellular matrix that holds water and supports tissue turgor. Injectable HA fillers cross-link the molecule to extend its durability — the degree of cross-linking determines the product’s firmness, or “G prime.” Juvéderm, Restylane, Belotero, and RHA Collection are all HA-based. Each product within these lines has specific rheological properties designed for specific anatomical applications. A product designed for deep cheek augmentation should not be placed in superficial lip tissue, and vice versa.
Collagen Stimulators
Sculptra (poly-L-lactic acid) and Radiesse (calcium hydroxylapatite) work differently from HA fillers — they stimulate the body’s own collagen production rather than adding immediate volume. Results appear gradually over 2–3 months and last 18 months to 2+ years. They are not reversible with hyaluronidase. These products are appropriate for patients seeking broad structural improvement rather than targeted volume replacement, and for those who prefer longer intervals between treatments.
Appropriate Uses by Area
- Cheeks: Firm, high-G-prime HA or Sculptra for structural support
- Lips: Soft, low-G-prime HA with natural movement (RHA, Restylane Kysse)
- Tear troughs: Thin-consistency, low-G-prime HA placed deep with caution
- Jawline/chin: Firm HA or Radiesse for structural definition
- Temples: Sculptra or firm HA for volume restoration
- Nasolabial folds: Medium-consistency HA placed deep
Longevity Expectations
Published longevity data varies from 6–24+ months depending on product and location. In practice, fillers in high-movement areas (lips) last 6–9 months; fillers in low-movement areas (cheeks, temples) often last 12–18 months. Collagen stimulators last 18 months to 3 years. It is important to note that HA filler does not disappear cleanly at its stated duration — it degrades into increasingly hydrophilic fragments that can contribute to chronic puffiness, particularly in the tear trough area, when treatments are repeated over many years.