Now this is something I am very familiar with, although the solution has been VERY elusive.
About a year ago, my make Jax staring doing this. It coincided with a temporal gland infection, but even long after the infection was completely gone, the tongue problem persisted. Everybody seems to have a different opinion as to why this happens. It's been attributed to micro-nutritional imbalances, injuries, lack of exercise, etc.
Currently, my Jax still has problems. I have tried EVERYTHING to fix this, and nothing has worked. I have tried stopping supplementation all together for three months (for possible overdose): no change. More supplementation for three months: no change. A very normal, recommended supplementation regimen: no change. Making him "work" for his prey: no change. I use the highest quality products I can get my hands on, and still no change. For the record, here are my setup specs:
-48"x24"x30" PVC -coated cage with plexiglass bottom
-Ficus tree, potted, with flat stones over soil
-various vines and sticks for climbing
-Habba-Mist set to mist tree every 3 hours
-morning hand-misting for 15 minutes
-Miner-all once a week
-Herptovite once every two weeks
-Walkabout Farms cricket gutload
-2 reptisun 5.0 tubes
-3 regular household tubes
-1 basking bulb, 40 watts
-75 degree ambient temp, 81 degree basking spot
-70% humidity
-crickets or superworms every other day
-14 hours sun, 12 hours dark
-gums and mouth juncture swabbed once a week with chlorohexadine
My Jax is absolutely gorgeous, with 1" orbital horns and a 1.5" rostral horn, perfectly shaped. He is above average size for a male, but not too thin and not too heavy. He has no infections, lesions or injuries of any kind. He is active, and "patrols" his cage freqently when not perched at the top of his tree.
I have lost all hope trying to correct the tongue problem. I just can't possibly see what I'm doing wrong. If anyone has any ideas, I'd love to hear them.