If you have had nasal cavity surgery ,oral or dental surgery in the previous 2 months ,  Consult your surgeon or dentist before using this appliance .  Should use nasal nozzles to clean the nasal cavity and should use "soft" mode .  Do not jet the water to the tongue directly as well as to the ear ,nose or other sensitive areas.  The high pressure maybe will cause serious damage at these parts.  Children should be supervised and do not play with this device.  Only fill with pure water or solutions recommend by dentist when you clean the oral area and teeth .  Only fill with warm salt water when you wash the nasal cavity .  Some antibacterial solutions should shorten the lift of the product.  People who has experience of nasal diseases like rhinitis ,  or people has experience of gum pain may not be to use this device and should consult the doctor or dentist .  Do not put the nozzle against your teeth or gums tightly , this may injure your gums.      Package Include:  Pressure water flosser*1  Nasal nozzle *1  Oral nozzle *1  Use mannuel *1      How to use :  Directing the water jet flow at a 90°degree angle to the teeth and gums.  Directing the water jet slowly along the teeth.  Directing the water jet along the gum line with nozzle tip at a 90°degree angle to the gum tissue.  Cleaning between the teeth and around any brace ,crowns or bridgework thoroughly .  Do not spray water to periodontal pockets directly.