I once tried to completely dissolve my lip filler and had a bad experience. After like 6 appointments, it still wasn't totally dissolved. I eventually tried to even it out by adding new filler. That was over a year ago. My lips currently look like crap and I think I need to completely dissolve the filler I still have. Does dissolving with the aid of ultrasound (I've also seen MRI?) make a major difference? Is it worth the extra cost?