I suffer from severe migraines and I heard about this sleep Dr/Dentist Dr. Peterson who makes sleep guards and NTIs for migraine headaches... I went to Dr. Peterson and he made me a NTI . I was a little unsure if this would work because nothing has worked for me in the past!! All i can say is i haven't had one migraine since having this NTI made... On behalf of all the Peterson's staff I wanna thank you so much because i can actually have a normal life again!