Head foci refer to chronically inflamed tissues in anatomically predisposed areas. Depending on their location, sinusoidal, otogenic, tonsillogenic, and odontogenic head foci can be distinguished. In regulatory medicine, they are assessed as overarching physical burdens, making the diagnosis and therapy of head foci and disturbing factors in the oral cavity particularly significant for overall health. Due to their complex processes, their potential effects are not suitable for interpretations under conventional medical perspectives; therefore, the viewpoint for diseases following these patterns must be expanded from a systematic to a systemic approach. Consequently, each focal disease is part of a highly individual health development, and its diagnosis and therapy must be tailored accordingly.