Did you learn more information about the center for head and facial movement disorder since your original post in 2010?
My son is 8yrs old and he has very loud vocal tics.
He is on a gluten free, casein free, MSG, AF and color free diet but unfortunately it's not currently making any positive changes.
He is also taking fish oil, magnesium/calcium/zinc, vitamin D drop and iron.
His tics are frequent and intense. And I'm back on the hunt feverishly trying to see what I can do to help calm his body or reduce the frequency and or intensity.
This past week, he ticced for 90 minutes