Abstract This study aimed to describe the structure of oral health services in primary health care in Brazil with centers participating in the second cycle of the 'National Program for Improving Access and Quality of Primary Care' (PMAQ-AB), the largest health service evaluation program ever instituted in the country. This cross-sectional study evaluated 16,202 oral health services, regarding 22 pieces of dental equipment and 25 dental supplies. The presence of each piece of equipment/dental supply generated a score for services. The sum of these scores was compared among different regions in Brazil. Quantitative data were described by quartiles and categorical data by frequencies, using the SPSS, version 25. Most of the evaluated centers presented adequate equipment in good using conditions and sufficient dental supplies for primary oral health care. Data also showed a lack of some equipment, such as X-rays, bicarbonate jet, and ultrasound devices, while for dental supplies, a lack of amalgam (capsule and manual preparation), anesthesia without vasoconstrictors, and intracanal medication was found. The services presented a median of 14 pieces of equipment and 22 dental supplies. Of the Brazilian regions, the South presented the highest median, while the North and Northeast regions presented the lowest one. The oral health services presented dental offices with good availability of equipment and dental supplies to perform clinical activities. However, differences in the structure of services among the Brazilian regions was still observed.