We don’t know what’s more painful: suffering chronic migraines or seeing the dentist. Mercifully, the FDA-approved NTI Tension Suppression System can spare you both. The plastic mouth guard prevents you from grinding and gnashing teeth, thus reducing temple contractions and, by association, headaches. Clinical trials show 82 percent of users experienced a 77 percent drop in migraine frequency within eight weeks of use. (Added bonus: Some insurance providers will pay for it.) Prescription required. $450 to $750. www.headacheprevention.com