Bleeding from tooth brushing is a common oral symptom and does not act as a precursor to malignancy.
The etiology is poor oral hygiene, inflammation of the gums caused by local plaque and tartar, systemic factors such as endocrine changes, puberty and pregnancy can aggravate already existing inflammation, and the incidence of bleeding gums caused by systemic diseases such as leukaemia and haemophilia is low; therefore, when patients brush their teeth and bleed, it is usually not a malignant tumour.