Introduction: oral treatments are procedures that require a visual and tactile diagnosis, there is a high risk of infection by biological products. Objective: determine the types of treatments and protection barriers implemented before and during the COVID-19 pandemic in three states in Mexico. Material and methods: it was an observational, analytical and longitudinal study in private clinical care dentists, educational and/or health institutions, through a non-probabilistic sampling by quotas of 100 dentists per entity. The information was collected in a Google form distributed via WhatsApp and emails. The data was processed in SPSS v. 22. Results: the treatments implemented before the pandemic period were those scheduled with 87.2%, during the COVID-19 pandemic the main care continued as scheduled (90.9%) where the protection barriers that increased the most were eye protection such as goggles (84.8%) and facial mask (83.1%). Presenting the substitution of the three-layer mask for high filtration KN95 (78.0%) and the disposable suit (53.0%). Conclusion: the treatments carried out before and during the pandemic were programmed, the barriers that increased were googles, face shield, KN95 mask and insulating suit.