Objectives: The aim of this research is to establish social realities where the habits of maintainingDiploma thesis title: Oral health knowledge and oral hygiene habits among the students of Split-Dalmatia County Objectives: The aim of this research is to establish social realities where the habits of maintaining the oral hygiene are created. Primary school students of higher grades are being raised to behave independently and responsibly in regards to preserving health by habit grounds which are acquired within the nuclear family and the trust they gain in an open communication with their dentist. Research made so far has shown health education efficiency in plaque control, and at the same time in dental illnesses themselves. Bad oral health has a big impact on quality of life either regarding children, adults or the elderly. It is necessary to implement the knowledge of cause and prevention of the most frequent oral diseases since bad oral habits are the cause of adult's illnesses. Adequate information, programs and motivation lead to attitude changes about the importance of conducting oral hygiene habits and preserving oral health. Patients and methods: Establishing oral hygiene habits of primary school students of higher grades, and their knowledge of oral health have been examined by quantitative and qualitative methods of research, through two research phases: forming of focus groups-used to carry out problem-oriented interview (in-depth interview) which led to the research plan, research field,creating the questionnaire used to conduct anonymous survey examining on the sample of 1001 students of primary school students of higher grades of Split-Dalmatia County. This study contains the processed and descriptively interpreted data, in the purpose of checking the set, and later the established first hypothesis which is the following- the primary schools students of higher grades do not adhere to the core principles of oral hygiene; the confirmation of the set second hypothesis according to which the students do not possess complete information about oral hygiene rules and needs. These hypotheses are in correlation which leads to the conclusion that the main preconditions of applying the right behavior concerning the oral health care are the right time information and education, complete transfer of information concerning basic principles of right behavior conduct which are preceded by acquiring habits and the positive attitude towards the oral health. Results: The results show the necessity for changing all the flaws of primary education in the field of health education among the young and the intensified communication with the doctor which should not be only clinical but informative as well. the oral hygiene are created. Primary school students of higher grades are being raised to behave independently and responsibly in regards to preserving health by habit grounds which are acquired within the nuclear family and the trust they gain in an open communication with their dentist. Research made so far has shown health education efficiency in plaque control, and at the same time in dental illnesses themselves. Bad oral health has a big impact on quality of life either regarding children, adults or the elderly. It is necessary to implement the knowledge of cause and prevention of the most frequent oral diseases since bad oral habits are the cause of adult's illnesses. Adequate information, programs and motivation lead to attitude changes about the importance of conducting oral hygiene habits and preserving oral health. Patients and methods: Establishing oral hygiene habits of primary school students of higher grades, and their knowledge of oral health have been examined by quantitative and qualitative methods of research, through two research phases: forming of focus groups-used to carry out problem-oriented interview (in-depth interview) which led to the research plan, research field,creating the questionnaire used to conduct anonymous survey examining on the sample of 1001 students of primary school students of higher grades of Split-Dalmatia County. This study contains the processed and descriptively interpreted data, in the purpose of checking the set, and later the established first hypothesis which is the following- the primary schools students of higher grades do not adhere to the core principles of oral hygiene; the confirmation of the set second hypothesis according to which the students do not possess complete information about oral hygiene rules and needs. These hypotheses are in correlation which leads to the conclusion that the main preconditions of applying the right behavior concerning the oral health care are the right time information and education, complete transfer of information concerning basic principles of right behavior conduct which are preceded by acquiring habits and the positive attitude towards the oral health. Results: The results show the necessity for changing all the flaws of primary education in the field of health education among the young and the intensified communication with the doctor which should not be only clinical but informative as well.