Oral Irrigator +4 Jets 3 Mode USB Rechargeable Water Flosser Portable Dental Water Jet Waterproof Irrigator Dental Teeth Cleaner 0ral irrigatorOral Irrigator +4 Jets 3 Mode USB Rechargeable Water Flosser Portable Dental Water Jet Waterproof Irrigator Dental Teeth Cleaner Note: 1. You had better close most of your mouth to avoid the water spray off. 2. Please choose the soft mode when you use it at the first time. 3. If your teeth are sensitive, please use warm water, it will be more comfortable. 4. You need to charge the water flosser for 4 hours before first time use. 5. Change new nozzles