Teosyal and Juvederm - Why won't the enzyme dissolve my filler?

i've been getting lip filler for about 16 years now. I recently decided I wanted to dissolve to start from scratch as the techniques have come so far since then. I went in for my first round of dissolving & it didn't really touch the filler. I've only ever had Teyosal and Juvederm so very standard HA fillers. Filler does tend to last much longer on me than the average person. My Dr. seems perplexed as to why it didn't work at all. Any ideas?