INDIANAPOLIS -- The Food and Drug Administration has approved a nighttime mouth guard that a company says can ease and prevent migraines.

The mouth guard, called Nociceptive Trigeminal Inhibition Tension Suppression System, or NTI-tss, fits over a person's two front teeth.

Users wear the guard during sleep. The device prevents teeth-clenching -- which, in turn, prevents migraine and tension headaches, according to Mishawaka-based NTI-tss Inc.

In clinical studies, most migraine sufferers who used the guard experienced a reduction in migraine pain attacks, the company said.

The company warned that the origins of migraine headaches haven't been scientifically identified. Still, research has shown that relaxing the intensity of neuromuscular contractions in the head, neck and jaw during sleep can reduce the occurrence and the severity of recurring headache pain, it said.

Following is a list of Indianapolis dentists who prescribe the NTI-tss mouth guard:

Michael P. O'Neil, 6470 N. Shadeland Ave., Ste. A

Michael Tillery, 3410 N. High School Road

Steve Douglas, 6745 S. Gray Road , #F

Charles Solomon, 3945 Eagle Creek Pkwy., Ste. A

John Hartman, 3091 E. 98th St., Ste. 220

Craig Lee Mitchell, 2946 Waterfront Pkwy. West Drive

Joseph Bailey, 1035 N. Post Road

Brad Swanson, 6022 Primrose Ave.

Matthew Stegemiller, 1505 E Southport Road

Jerry Hickman, 8001 Shelby St.

J. Gary Bischoff, 1321 Newfield Lane

Robert Caird, 9014 Pendleton Pike

Christopher Burns, 8170 Oaklandon Road, Ste. B

William C. Tellman, 5750 E. 91st St., Ste. A

Janet Pole, 3808 N. Lawndale Ave.

Philip Lockhart, 8202 Clearvista Parkway