i used a NTI about 3 years ago for only 3 weeks, but it didnt alleviate any of my symptoms. altho, i did not have sinus problems. also, i developed an openbite because of it, which hasn't gone away.
from my experience, the NTI seems to be effective for some headache sufferers.
it seems like a lot of people here have used it, so maybe they'll be more helpful to you.
- saaraah.
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NTI???????????? 
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