Introduction and objectives: The principal methods of preventing the formation of dental plaque is its mechanical removal by brushing with a toothbrush and toothpaste and using mouthwashes. The aim of the study was evaluation of the frequency of use and kind of mouthwashes used, factors affecting the choice of particular mouthwash, and knowledge concerning those products by 17-year-old youths. Material and methods: A survey study comprised 270 randomly selected high school students. The obtained results were statistically analyzed. Results: The study proved that mouthwashes are used by slightly more than 1/3 of the youths, whereas only 14% of them use them frequently enough. The most popular mouthwashes in this age group are those of recognizable international brands, which widely advertise their products. Commercials are the main source of knowledge about mouthwashes which are purchased mainly in drugstores. The choice of mouthwash is determined by its price and taste, while the aim of using the products is better oral freshness. The vast majority of the youths did not have any knowledge concerning mouthwashes, were unfamiliar with their content, and did not pay attention to the inclusion of active ingredients when buying. Conclusions: Low awareness concerning the methods and principles of oral hygiene was proved. There is a need for broader promotion of the use of mouthwashes in everyday hygiene, as well as for a more in-depth knowledge about the right choice of such products depending on the prophylactic-therapeutic recommendations.