A healthy 70-year-old presents wanting to improve the appearance of her teeth. She has no caries and healthy periodontium. All of the following are reasonable options EXCEPT:

Correct answer: B. Serial extraction

• A. Incorrect. Adults can absolutely be treated with fixed appliances; age is not a contraindication when the periodontium is healthy.
• B. Correct. Serial extraction is an interceptive orthodontic procedure performed in the mixed dentition (roughly ages 8–10) to manage arch length deficiency. It has no application in an adult.
• C. Incorrect. Clear aligners are commonly used for adult esthetic alignment.
• D. Incorrect. Veneers are a standard conservative esthetic option for an adult with healthy teeth.