Tympanometry is a simple, painless, quick, non-invasive diagnostic test that indicates the condition and function of the Eustachian tube and eardrum. Polishing or blowing is a procedure that speeds up the healing of the Eustachian tube. Polishing or blowing is very simple and painless with the help of pressurized air that is blown through the nose at the moment the patient pronounces the letter "k" or the patient can close the nose and blow on it. Research into the antibacterial effect of essential oils, which are now most commonly used in healthcare and traditional medicine, could be one of the promising solutions to this growing problem. Modern devices for inhalation therapy enable exceptional quality of spraying sea water and essential oils and other medicines, which achieves exceptional efficiency of inhalation therapy procedures. The aim of the research is to evaluate the effectiveness of treatment of Eustachian tube dysfunction through inhalation therapy at the Department of Inhalation Thalassotherapy in Crikvenica. The research will include 108 outpatients residing in the Republic of Croatia, aged 18 to 60, of both sexes with a diagnosis of Eustachian tube dysfunction. The criterion includes a tympanogram type C at the first examination by an ENT specialist and a control tympanogram after inhalation therapy for ten days. Three independent variables (gender, age, procedure after polyceration) and two dependent variables (results before inhalation therapy and after therapy) will be processed. In statistical data processing, parametric and mostly non-parametric tests will be used. Data processing will be done through descriptive and inferential statistics. Testing of statistically significant differences between the values of dependent variables before and after therapy will be performed using the chi-square test with a significance level of p<0.05. The use of inhalation therapy has a positive effect on improving the function of the Eustachian tube. The procedure performed using the polishing method has a significant effect on the reduction of Eustachian tube dysfunction. Treatment of Eustachian tube dysfunction through inhalation therapy at the Department of Inhalation Thalassotherapy in Crikvenica has proven to be effective.