Is Prolonged Use of Restylane Safe?

many of my patients who have continued their fillers such as Restylane or Juvederm have had occasions where they were not able to come back for more than a year and I have never seen stretched out saggy or wrinkled skin worse than baseline before the first filler was ever injected.

Your "expert" doesn't sound like a true expert with fillers. In fact, this is the first time I have ever heard anyone make this comment.   I have been injecting fillers for 20 years and between my experience, that of my colleagues (see Dr. Lupo's answer above) and all of the research that has been done, I can tell you without a doubt that fillers will not make the skin look crepey or unhealthy, only sun damage or perhaps normal aging will do that.  

Hyaluronic acid fillers like restylane and juvederm are actually very safe products since hyaluronic acid is normally found in your skin between cells and also in your knee and elbow joints. Recent studies have actually shown that repeated injections of hyaluronic acid actually can last up to 18 months or more. In fact, I have seen in some patients that after several years of injections they actually need less product down the road so there may be some positive building up of one's own collagen. I hope this information helps.