Random allocation
tooth
Patients who visited Tohoku University Hospital or a private dental clinic with symptoms of DH were asked to enroll in this clinical trial. In total, 40 patients consented to be assessed for eligibility. After written informed consent was obtained from the patient, the baseline VAS examination was performed by the examiner. As stated in inclusion criteria (4), test teeth were selected using split-mouth design. We examined the tooth that a subject felt was the most painful in daily life, and if the VAS value was 30 mm or greater, the tooth was designated as “Test tooth 1.” We chose “Test tooth 2” in order of priority: left–right opposite side, left–right upper–lower opposite side, and upper–lower opposite side of “Test tooth 1.” If “Test tooth 1” was the anterior part of the tooth, examination was performed on the anterior part, and if it was the molar part, examination was performed on the molar part. The tooth with the highest VAS value of 30 mm or greater was designated as “Test tooth 2.” The investigator then contacted the registration center and the test teeth were randomly allocated to one of the two treatments (i.e., PJD or TMD). The random allocation was performed using an interactive web response system. Figure 
Flowchart of treatment