( InStyle ) -- Life is full of reasons to smile , but expressing joy can cause lines to form around your eyes and mouth . Luckily , you do n't have to grin and bear it . Read on for tips to keep creases at bay and make skin look smoother and younger . Naomi Watts confidently flashes her radiant smile . Why wrinkles form . 1 . Decreased volume . Over time , skin loses fat and produces less hyaluronic acid , a substance that retains moisture . As a result , mature skin is thinner and drier than young skin . `` Like a helium balloon the day after a party , '' says Beverly Hills dermatologist Mark Rubin , `` when skin is not filled to the same degree , you 'll see crinkling on the surface . '' Minimize the effects . Apply moisturizer to temporarily rehydrate ( and plump up ) the skin . For more help , try filler injections . 2 . Loss of elasticity . As skin ages , the collagen and elastin fibers in the dermis break down , reducing skin 's ability to `` snap back '' from smiles and other facial expressions . Exposure to sunlight accelerates this process , especially UVA rays , which penetrate deeper into the skin than UVB rays . Minimize the effects . Wear broad-spectrum sunblock ( look for such ingredients as Mexoryl , Helioplex and avobenzone ) , and apply an antioxidant cream daily . To build collagen , try products with vitamin A , peptides or growth hormones . 3 . Repetitive motion . Dynamic movements that cause the skin to repeatedly crease in the same place , such as smiling , will wear down the underlying tissue in that specific spot , creating a line that remains after muscles relax . Minimize the effects . Smiling is essential , but you can limit other motions that deepen crow's-feet . For example , wear sunglasses to keep from squinting in bright light . For the most dramatic results , consider Botox . Expert help for smile lines . For fast results , consider in-office procedures for trouble spots . 1 . Injectable fillers . Collagen and hyaluronic acid fillers ( like Restylane ) can be injected directly into wrinkles to restore volume loss . Collagen is thin and more viscous , making it easier to apply under thin eye skin . By contrast , hyaluronic acid , which is denser and lasts longer , is better suited for filling the nasolabial area ( the lines from mouth to nose ) . Primary area of use : Crow 's feet and nasolabial folds . Costs : Collagen : $ 250 -- $ 550 per area ; hyaluronic acid : $ 300 -- $ 850 per area . Lasts : Collagen : 3 -- 4 months ; hyaluronic acid : 6 -- 12 months . Downtime : Swelling can last 1 -- 2 days ; some slight redness . Risks : Bumpiness and bruising . Our experience : These deep injections hurt , but our tester saw immediate improvement in nasolabial folds . She had no swelling . Insider tip : If you get a bump , massage the area within 24 hours to smooth it out . 2 . Botox . Botulinum toxin , aka Botox , `` relaxes the muscles , so when you smile , the skin wo n't crinkle up in the area around your eyes , '' says Michigan dermatologist D'Anne Kleinsmith . Limiting repetitive movements prevents the formation of wrinkles in those areas and lessens the appearance of existing lines . Primary area of use : Forehead , brow lines and crow's-feet COST $ 200 -- $ 500 per area . Lasts : Approximately 3 -- 4 months . Downtime : Virtually none , but slight swelling ( that looks like a welt ) may last a few hours following the injection . Risks : Drooping of the eyelid or brow ( rare ) Our experience : Slightly painful . It takes three to four days for dynamic wrinkles ( that appear when you make facial expressions ) to disappear . Insider tip : Avoid blood thinners such as ibuprofen or aspirin before treatment ; they increase the risk of bruising . At-home treatments . Use topical products to look better today -- and tomorrow . Instant fix . `` Anything you can do to hydrate your skin softens the appearance of fine lines , '' says dermatologist Susan Weinkle of Bradenton , Florida . For spot treatment of wrinkles , a product with a thick , cushiony feel fills in cracks better than a thinner cream or serum . Try : Estée Lauder Perfectionist Correcting Concentrate for Deeper Facial Lines/Wrinkles . Long-term help . Nothing will turn back the clock or erase damage caused by sunbathing , but you can stimulate the production of new collagen to bolster the skin 's thickness and firmness . Look for products with retinol ( like Clinique ) or peptides ( like Olay ) . Try : Olay Regenerist Micro-Sculpting cream or Clinique Zero Gravity Repairwear Lift . E-mail to a friend . Get a FREE TRIAL issue of InStyle - CLICK HERE ! Copyright © 2009 Time Inc. All rights reserved .
They come with age because of less fat , loss of elasticity . Injectable drugs can replace fat and diminish wrinkles . They can relax muscles , lessons out of lines . Clean skin from sun to prevent skin cancer .