Due to supply chain issues your product may not ship with an instruction guide. Instructions are available on the Zyppah Amazon Store: https://www.amazon.com/stores/page/8D7F38C9-2EEA-4697-9A98-8E2C627D8ACA?ingress=3&visitId=0cc34ba6-81a2-44cd-8d28-0143156ef6ef The ZYPPAH Anti-Snoring Mouthpiece is the only snoring solution of it's kind. ZYPPAH (Happy Z spelled backwards) is an FDA-cleared, self-molded, boil-and-bite oral appliance that is effective, safe and easy to use, and Made in the USA. Get the most popular hybrid-oral snoring appliance and eliminate your snoring. Every ZYPPAH comes with a 90-Day warranty and is guaranteed to work or your money back.