Introduction.

COVID-19 vaccines may cause adverse reactions of varying types from mild to severe. Immunization with the vaccine reduces the risk of infection with the virus. Dentists are professionals at high risk of contagion due to high exposure to aerosols and close contact with the patient during dental procedures. No studies have been found at the national level that have evaluated the adverse reactions and effectiveness of vaccination. Objective. To describe the side effects of the anti-COVID-19 vaccine in dentists. Methodology. Cross-sectional descriptive observational study that included dentists from several parts of the country. The participants answered via the internet a self-administered survey containing sociodemographic and occupational questions, and related to vaccination and COVID-19 infection post-vaccination. Results. Of the 675 dentists who responded to the survey, 664 (98.4%) reported having been vaccinated, and 579 (87.20%) of them completed the vaccination schedule, 515 (76.3%) described at least one adverse reaction, pain at the puncture site was present in 387 (57.3%), asthenia in 192 (28.4%), and headache in 181 (23.7%) among the most frequent reactions. After the vaccination, 64 (9.3%) respondents claimed to have been infected with COVID-19, of them four (6.3%) required hospitalization, all in the ward. Conclusions. No association was found between age groups and vaccine type with infection by COVID-19 post-vaccination. Although no serious post-vaccination reactions were reported, the presence of symptoms must be attended to in order to rule out infection.