The correct answer is option 3: teeth and gums. Pyria, also known as periodontal disease or gum disease, primarily affects the teeth and gums. It is a condition in which the gums become infected and inflamed, leading to tooth loss if left untreated. The plaque buildup caused by poor oral hygiene is a major factor in the development of pyria. The bacteria in the plaque can infect the gums, causing them to pull away from the teeth and form pockets. As the infection progresses, the bone supporting the teeth can be damaged, resulting in tooth loosening and eventual loss. Therefore, it is important to maintain good oral hygiene practices such as regular brushing, flossing, and dental check-ups to prevent pyria.