Is It Possible That Juvederm Lasts over 18 Months ?

Generally, Juvederm Ultra
Plus XC lasts for approximately 9-12 months, but this can be shorter or longer depending on your body. I recommend you see your injector again and discuss your concerns with them. Hyaluronidase can be used to dissolve any residual filler or another treatment may be more suitable.

Although this is an area that tends to dissolve the filler quickly, it is possible that the result can stay for more than a year. If you are unhappy with the result, it might be worth having hyaluronidase injected into the area to see if it dissolves.

A Juvederm injection to the nasolabial fold will generally last up to one year.  On some individuals I have seen it last longer and on others not as long.  It all depends upon the rate at which your body metabolizes the product.

Extensive trials and reports have shown that Juvederm typically dissolves within 6 months to one year after injection. However, anecdotally, many patients have reported feeling the substance up to 3 years later. If you are concerned about the appearance of your lips, I recommend returning to your physician and requesting that they use hyaluronidase to dissolve whatever product may still remain.

While you may have the feeling that the filler material is still there, it is highly unlikely that it really is. Juvederm simply doesn't last that long, nor does any known approved hyaluronic acid-based injectable filler. For the sake of discussion, let us assume it is still there. You have now waited 18 months. Rather than having any hyaluronidase injected into the lips, just give it more time. You have waited this long. Just give it a few more months as it is a self-solving concern.