Sources and methodology

Where our numbers come from, how we turn guidance into tools, and the limits of what a tool can tell you.

Main sources across the site

OrganizationWhat we use it for
American Dental Association (ADA) and MouthHealthyTooth eruption charts, emergency definitions, fluoride, pain-relief guidance, brushing and toothbrush care
American Academy of Pediatric Dentistry (AAPD)Tooth development chronology, first dental visit, fluoride therapy
American Academy of PediatricsTeething, fluoride toothpaste for children
American Association of Orthodontists (AAO)Orthodontic checks and retainer care
American Academy of Periodontology and European Federation of PeriodontologyThe 2017 classification of periodontitis
Centers for Disease Control and Prevention (CDC)Community water fluoridation
U.S. Food and Drug Administration (FDA)Medicine labels and safety notices
NHS and UK clinical guidanceUrgent dental care tiers and red flags
International Association of Dental Traumatology (IADT)First aid for knocked-out teeth
World Health Organization (WHO)Tooth notation, DMFT survey methods
Cochrane reviews and peer-reviewed journalsEvidence on complications such as dry socket

Each tool page lists the exact documents it uses, with links and the date we checked them.

How we turn guidance into a tool

  1. Collect the data from the primary documents, with the source next to every number.
  2. Decide how to read it. For example, an eruption range of "8–12 months" covers babies up to the day they turn 13 months. We explain every such choice on the tool page under "How this tool works".
  3. Write the logic separately from the page, so it can be tested.
  4. Test it against the published values and edge cases.
  5. Explain the limits in plain words on the page.

Limits of any dental tool

Tools describe what's typical in groups of people. They can't examine your mouth, see an X-ray or know your medical history. Use them to understand and prepare, and let your dentist or doctor make decisions about your care.