A closer look at oral biofilm.

Bacterial shapes & movement

Spirochetes

Thin, spiral-shaped bacteria that move with a twisting motion. Some oral spirochetes are found more often with periodontal disease, but they are interpreted as part of the complete clinical picture.

Bacterial shapes & movement

Clock Arms

“Clock arms” is an informal visual name for organisms that appear to have slender extensions moving like the hands of a clock. The term describes their appearance under the microscope, not a diagnosis.

Bacterial shapes & movement

Large Gliding Rods

Long, rod-shaped bacteria that appear to glide smoothly across the microscope view. Their size and movement help illustrate the diversity of the oral biofilm.

Bacterial shapes & movement

Small Gliding Rods

Shorter rod-shaped bacteria that can move quickly across a live sample. Their presence alone does not show whether gum disease is present.

Bacterial shapes & movement

Spinning Rods

Rod-shaped bacteria that rotate or spin as they move. Similar forms may appear under different oral conditions, so the rest of the examination provides important context.

Bacterial shapes & movement

Motile Cocci

A visual label for round bacterial forms observed moving within a live sample. Cocci can also be part of a healthy oral biofilm, and movement is not diagnostic by itself.

Microscope-inspired educational illustration.

Protozoa

Amoebas

Amoebas are single-celled organisms that change shape as they move. Certain oral amoebae, including Entamoeba gingivalis, have been reported more often in people with periodontal disease, although their exact role is still being studied.

Protozoa

Trichomonas tenax

A small, flagellated single-celled organism that may occur in oral biofilm. Studies have reported it more frequently with periodontitis, but seeing it does not by itself establish a cause or determine treatment.

Yeast

Yeast / Candida

Candida is a type of yeast commonly present in the mouth in small amounts. When conditions allow it to overgrow, it can contribute to oral thrush; any symptoms or concerns require clinical evaluation.

Your body’s cells

White Blood Cells

White blood cells are immune cells that may appear when oral tissues are responding to inflammation, irritation, or infection. Their presence does not provide a measure of a person’s overall immune health.

Microscope-inspired educational illustration.

Your body’s cells

Red Blood Cells

Red blood cells may appear when gum tissue is bleeding or irritated. They do not identify the cause of bleeding on their own, so the finding is considered alongside the clinical examination.

Microscope-inspired educational illustration.