Deep hydration treatment consisting of microinjections of low-density hyaluronic acid (non-crosslinked or lightly crosslinked) evenly distributed across the face, neck, décolletage, or hands. Unlike traditional fillers, it does not aim to add volume but to improve the intrinsic quality of the skin, providing hydration from within, stimulating collagen and elastin production, and improving elasticity, luminosity, and skin texture. Especially indicated for dehydrated skin, lack of firmness, fine lines, or early signs of aging. Results are progressive and optimized with 2-3 initial sessions (spaced 2-4 weeks apart) and maintenance every 4-6 months.