For dentists it can be challenge to recognise patients wit bone-modulating medications. Patients do not always mention which medications they use or have used, while the effect on the bone can still be present long after patients have stopped taking the medication. Patients are often able to report accurately what disorder(s) they have and certain disorders should cause dentists to be alert. Patients who can be defined as the Big Five users of bone-modulating medicaments are: 1. patients with osteoporosis, 2. patients who have been long-term users of glucocorticoids, 3. patients with solid tumours, 4. patients with multiple myeloma and 5. patients with congenital or hereditary bone disorders. These patient groups have an indication for bone-modulating medicaments. These are anti-resorptive medications (such as bisphosphonates and denosumab) or anti-angiogenic medications. By recognising the correct patient group, dentists can ask appropriate questions about the use of medicaments in the present or in the past. A dentist can recognise patients with a risk of medication-related osteonecrosis by using this method.