Minimally invasive pulpotomy is usually done with a very clear understanding of the patient’s dentition in preoperative preparation. Pre-operative x-rays are usually taken to understand the cause of the disease, and then the cavity design for minimally invasive pulpotomy is done. Usually, it is better to enter from the diseased part of the tooth and at the same time to achieve the required cavity shape for later pulpotomy, so that the root canal treatment can be done smoothly and effectively. Minimally invasive pulpotomy is sometimes performed before the procedure, in addition to x-rays and other examinations, and sometimes a digital guide design is done. The pulp opening under the guide is similar to the daily guided surgery and guided implantation, which is also designed digitally and at the same time in the pre-treatment stage of minimally invasive treatment. It is also necessary to evaluate the direction and shape of the entire root canal, and to prepare the instruments for minimally invasive pulpotomy, including microscopy, ultrasound, and liquid instruments, all of which are designed and prepared before minimally invasive pulpotomy.