3.5 month dragon not eating

[Wyvern]

Hello,
My 3 and half month old male dragon is not eating properly anymore. He may eat 10-12 small feeder crickets in the morning then that is it. I got him Reptiworms thinking maybe he just didn't want the crickets anymore. He only ate 3 of the repti's. I am unsure what is going on with him. I have noticed a clicking noise in his jaw when he is chewing. There are no other noises, I do not suspect a RI.
He is currently in a 20 gallon long, Reptisun 10.0 (1 month old)able to get 6-8 inches from the light. Basking temp ~109F Cool side temp ~83F taken with a digital w/probe. Reptile carpet substrate, and some slate tile.
He is still pooping fairly normal every 1 -2 days. I dust with calcium +D3, 1 feeding a day, 5 days a week and multivitamins 1 feeding a day 2 days a week. He is offered greens but, rarely eats them, even before this issue.
When he is out of his enclosure he is active and curious. Still running and jumping. He shows no signs of MBD, other then clicking of the jaw, which if I am not mistaken is a progressed sign of MBD. He hasn't had a fecal as the are no local reptile vets.

[ladyknite]

He shows no signs of MBD, other then clicking of the jaw, which if I am not mistaken is a progressed sign of MBD.

Confusing statement

clicking of the jaw is not a PROGRESSED sign of MBD actually.  Malformation, breaking or dislocation is a sign, but MBD typically isn't this progressed in 3 1/2 month old dragons unless they're born with it.  Trust me, it sneaks in like a theif in the night and robs you blind.  But it stalks you for countless months beforehand.

I recommend you visit the vet to get that click checked.  not all respiratory signs are visible to the eye.  Corona virus carries a few distinct symptoms.