Objectives : The purpose of this study was to make a comparative analysis of the websites of dental office from different countries to provide some information for the quality evaluation of the websites of dental office. Methods : Two hundred twenty-four dental websites were selected by using Yahoo, one of the international portal sites, which included 59 from the United States, 50 from the United Kingdom, 54 from Canada, and 61 from Korea. Results : 1. As results of the credibility of the websites, the Canadian websites were most reliable, followed by the American websites, the English websites and the Korean ones(p<0.005). 2. As results of the complementarity of the websites, the Korean websites were most interactive, followed by the American websites, the English websites, and the Canadian ones(p<0.001). 3. As results of the accessibility of use of the websites, the Korean websites were easiest to use, followed by the American websites, the Canadian websites, and the English ones(p<0.001). 4. As results of the update of the websites from the nations, the Korean websites were most sustainable, followed by the English websites, the Canadian websites and the American ones(p<0.05). 5. When the overall quality of the dental office websites was assessed, the Korean websites were the best, followed by the Canadian websites, the American websites and the English ones(p<0.001). Conclusions : In order to make accurate oral health information more accessible to people in general, prolonged research efforts should be continued for the evaluation of the quality of dental office websites, and the development of standard international evaluation criteria is required as well.