[Only compatible Models: FC159 F5025 for NicwellOralfree water flosser.not for other water flosser brands or models.Please check your model number before buying. 【Periodontal Tips】A soft rubber tip designed for gentle low-pressure delivery of therapeutic rinses below the gumline.To alleviate the symptoms of gingivitis periodontitis periodontal pocket depth reduction. 【Scheduled Repalcing for Health】 We recommend replacing your Tips every 3 months because mineral deposits can collect and reduce performance over time. 【How to Use】Press the nozzle replacement button on the top of the water flosser; Then carefully pull out the old nozzle and insert the new one into the nozzle slot.It is easy to install and replace. 【Deep Cleaning 】The soft tips offer a smaller & flexible tip that may offer better cleaning of tight areas around & between teeth，and prevents tooth decaydental plaquedental calculusgingival bleeding and dental. 【Value Package】Package included 4 pcs Periodontal Tips in a clear storage case for your convenience and long-lasting use.The case is convenient to travel with.]