Objective To show the experience in oral cancer prevention and anti-ethanolism. Study Design Between 1989 and 2018 (divided into periods of 5 years each), health actions geared toward the prevention of oral cancer were carried out in Paraná, Brazil. A systematized anamnesis and an intraoral clinical examination were performed in individuals over 30 years of age who participated in the campaigns,. All answered a questionnaire with personal data and reports of risk habits, such as smoking and alcohol consumption. Results/Discussion There were 29,682 people, and 6,314 mouth lesions were detected in 21.3% of the evaluated population. The most common lesions found were: traumatic lesions with a prosthetic etiology (generally with a higher percentage), inflammatory leukoplakia, with characteristics for malignancy, papillomas, and erythroplakia. Percentages of alcoholics were recorded: 1989- 1993 (14.3%); 1994-1998 (14.7%); 1999-2003 (14.9%); 2004-2008 (13.8%); 2009- 2013 (17.0%); and 2014-2018 (22.8%). The percentage of alcoholic patients in 2008 showed a decrease. An ascendency was found, coinciding with the publicity of alcoholic beverages in the media. Conclusion We believe in health promotion in primary schools. To show the experience in oral cancer prevention and anti-ethanolism. Between 1989 and 2018 (divided into periods of 5 years each), health actions geared toward the prevention of oral cancer were carried out in Paraná, Brazil. A systematized anamnesis and an intraoral clinical examination were performed in individuals over 30 years of age who participated in the campaigns,. All answered a questionnaire with personal data and reports of risk habits, such as smoking and alcohol consumption. There were 29,682 people, and 6,314 mouth lesions were detected in 21.3% of the evaluated population. The most common lesions found were: traumatic lesions with a prosthetic etiology (generally with a higher percentage), inflammatory leukoplakia, with characteristics for malignancy, papillomas, and erythroplakia. Percentages of alcoholics were recorded: 1989- 1993 (14.3%); 1994-1998 (14.7%); 1999-2003 (14.9%); 2004-2008 (13.8%); 2009- 2013 (17.0%); and 2014-2018 (22.8%). The percentage of alcoholic patients in 2008 showed a decrease. An ascendency was found, coinciding with the publicity of alcoholic beverages in the media. We believe in health promotion in primary schools.