iPlus Enables Painless Biological Dentistry. For cavity preparation, it is often painless and shots are often avoided. Micro-fractures or thermal damage of teeth is minimized, due to no vibration. The laser is clean and precise, with minimally invasive cavity preparation. Discomfort is based on individual sensitivity to pain, and other factors, so not all patients can be treated without anesthetic. However, dentists using WaterLase to perform typical cavity preparations report not using anesthetic in the majority of cases. The iPlus is also excellent for periodontal disease and other gum related micro-surgeries.