I have had my lips injected with juvederm 5 times in the past 6 months, used both juvederm ultra and ultra plus. After 3 weeks my lips start to deflate, then between week 4 and 5 it dissapears completley. I have even been back to my dr and they have confirmed that the product is no longer present. I know the product last differently on different people but less than a month is ridiculous! Can someone please explain what could possibly be the problem?! I'm young, healthy,non smoker non drinker.