Colgate toothpaste

Colgate toothpaste

ZIMSEC O Level Combined Science Notes: Experiment: Testing tooth cleaning agent

Aim: To test the properties of teeth cleaning agents

Materials: various brands of toothpaste, pH paper, microscopes, slat, bicarbonate of soda, lid bottles/suitable containers for the toothpaste


  1. Examine toothpaste under a microscope to compare the particle size of the various abrasiveness
  2. Spread the toothpaste over a smooth surface
  3. Touch test it to compare the roughness
  4. Test the pH of various toothpaste brands by dissolving a small amount in distilled water and dipping pH ppaer into the solution
  5. Read the pH from off the universal colour code chart

Results and Observations

  • Most toothpaste have an abrasive quality to them although this varies from toothpaste to toothpaste
  • Toothpaste are bases (i.e. have a base of more than 7)

To access more topics go to the Combined Science Notes page