Dental habit-breaking appliances are devices used to help patients break harmful oral habits such as thumb sucking, tongue thrusting, or mouth breathing. These habits can lead to dental issues such as misalignment, open bite, or speech problems if left untreated. Habit-breaking appliances are custom-made to fit the patient's mouth comfortably and effectively discourage the unwanted behavior. Examples include thumb cribs, tongue cribs, palatal cribs, and tongue shields. These appliances work by creating discomfort or preventing the habit altogether, helping patients develop healthier oral habits over time. Regular monitoring by a dentist or orthodontist is crucial to ensure the appliance's effectiveness and the successful cessation of the habit.