Objective To investigate the application effect of myofunctional training combined with internet-based continuous nursing in children with non-obstructive mouth breathing malocclusion accompanied by bad habits. Methods A total of 60 children with non-obstructive mouth breathing malocclusion accompanied by bad habits treated at the Department of Pediatric Dentistry, Deyang Stomatological Hospital from February 2024 to February 2025 were selected. According to the random number table method, they were divided into the control group and the observation group, with 30 children in each group. The control group received conventional functional appliance combined with conventional nursing intervention, and the observation group received myofunctional training combined with internet-based continuous nursing on the basis of the control group. The clinical correction effect, malocclusion improvement, abstinence rate of bad habits and treatment compliance were compared between the two groups. Results The total effective rate of clinical correction and the malocclusion indicators in the observation group after treatment were all better than those in the control group (P<0.05). The abstinence rates of all bad habits in the observation group were all higher than those in the control group (P<0.05). The treatment compliance in the observation group (96.67%) was higher than that in the control group (76.67%) (P<0.05). Conclusion Myofunctional training combined with internet-based continuous nursing can effectively improve the correction effect in children with non-obstructive mouth breathing malocclusion accompanied by bad habits, optimize malocclusion indicators, correct oral bad habits and enhance treatment compliance.