The recommendation for biannual (every six months) dental visits became widely accepted and promoted in the community primarily in the 20th century, but its origins can be traced back earlier. This development was influenced by a growing understanding of preventive dentistry and the importance of regular dental care in maintaining oral health.

1. Early 20th Century:

- In the early 1900s, dentistry began to shift its focus from merely treating dental diseases to preventing them. This change was partly influenced by advances in dental science and a better understanding of oral diseases.

- The concept of routine dental check-ups, rather than just seeking treatment for dental problems, started to gain acceptance.

2. Post-World War II Era:

- After World War II, there was a significant push in public health initiatives, including oral health. This period saw a rise in public awareness campaigns about the importance of dental hygiene and regular dental visits.

- The American Dental Association and other dental organizations began to advocate more strongly for regular dental check-ups as a means of preventing dental issues.

3. Insurance and Employee Benefits:

- In the mid-20th century, dental insurance and employee benefit plans began to include coverage for preventive dental care. This further encouraged regular dental visits, as it became more financially accessible for many people.

- The insurance models often structured benefits around semi-annual check-ups, reinforcing the idea of visiting the dentist every six months.

4. Preventive Care Philosophy:

- The philosophy of preventive care emphasized that regular dental visits allow for early detection and treatment of issues like cavities, gum disease, and other oral health problems. This approach aimed to prevent small problems from becoming more significant and more challenging to treat.

5. Customised Schedules:

- While the six-month rule became a general guideline, dental professionals also recognise that individual needs vary. Some people, depending on their oral health status, risk factors, and overall health, may need to visit the dentist more or less frequently.

The biannual dental visit recommendation has been a significant factor in improving oral health outcomes and awareness. It remains a widely accepted guideline, although dental care is increasingly personalized to meet each patient's unique health requirements.