Nope, not in my experience. My veileds are the only chameleons that I have that get the white crustiness on the nose and really only my female veiled. I have never had a problem with her hydration. She gets the white crustiness around her nose occasionally.. maybe once every other month. I just dampen a cotton swab with plain water and gently wipe it away. As long as she has no other signs of dehydration (urates yellow or orange, sunken eyes, "loose" looking skin) then I wouldn't worry about it being a factor.
Over supplementation can also cause this, as Heika pointed out. What dusting schedule are you following? What are you gutloading your feeders with?