National Standards for Grade Levels 4-9
 
The Den-Test kit teaches students the benefits of good oral hygiene by visually demonstrating the effects of brushing on the amount of cavity related bacteria present on their teeth. Students learn sterile technique as they grow bacteria from their mouths on nutrient agar plates. Includes optional instructions for building an incubator box.  Required, but not included: incubator (optional), hot plate, and an autoclave or bleach. Designed for 24 students working in pairs.