A thin straight tip ideal for cats and small mouths. Tip Wear Guide Use the 42-12 Ultrasonic Dental Cleaner Tip Wear Guide to check if your device's tip needs replacement. 1. Excessive wear of the tip will reduce the performance of the dental cleaner as it will affect the ultrasonic frequency. 2. The ferrite rod must be tight - a loose or broken rod will cause weak or no vibration. 3. Using a properly functioning tip to set power from 3-4 lights will produce a cooling mist around the tip.