In orthodontics, pre vs post treatment photos primarily show what?

The primary purpose of pre-treatment and post-treatment photos in orthodontics is to visually document the changes in dental alignment and occlusion resulting from the orthodontic intervention. In this context, the correct answer relates specifically to the monitoring of root resorption, which can occur as a consequence of orthodontic forces applied to teeth during treatment.

Root resorption refers to the process where the body breaks down and absorbs the tissues of the tooth root. Orthodontic treatment, particularly when significant movement of teeth is involved, may lead to some degree of root resorption as a natural response to the mechanical forces being applied. By comparing pre-treatment and post-treatment photos, an orthodontist can assess any changes in the roots of the teeth, ensuring that the treatment is not adversely affecting the health of the teeth.

While the other options—nerve regeneration, tooth decay, and gum disease progression—are relevant issues that can arise within dental treatment and general oral health, they do not specifically pertain to the direct purposes of capturing pre- and post-treatment orthodontic photographs. These photographs are particularly focused on changes brought about by the orthodontics, where the impact on the roots of the teeth is a critical aspect of monitoring the treatment's effects.