Recommendation for a non-animal alternative to rat caries testing

Area of Science:

• Dental research
• Fluoride efficacy studies
• In vitro testing models

Background:

• Animal caries tests are mandated by the FDA for fluoride toothpaste efficacy.
• Industry practices favor alternatives to animal testing where possible.
• FDA regulations allow alternative methods if proven to be of equivalent accuracy.

Purpose of the Study:

• To introduce and discuss the Featherstone pH cycling model as a validated alternative to animal caries testing.
• To demonstrate the model's correlation with established animal caries models.
• To provide a scientifically sound basis for adopting this alternative method.

Main Methods:

• The Featherstone pH cycling model was compared against animal caries models.
• Key validation points included fluoride dose-response, dentifrice formulation comparisons, and differentiation of attenuated fluoride activity.
• The model's ability to represent the caries process and address salivary/abrasive interferences was assessed.

Main Results:

• The Featherstone model demonstrated equivalent accuracy to animal caries models.
• It showed clinically relevant fluoride dose-response and agreement with known dentifrice efficacies.
• The model successfully differentiated between formulations and represented the caries process, addressing potential interferences.

Conclusions:

• The Featherstone pH cycling model provides a reliable and accurate alternative to animal testing for evaluating fluoride toothpaste.
• Strong scientific evidence supports its use, correlating well with animal caries data.
• The scientific community and toothpaste industry are encouraged to adopt this model for ionic fluoride dentifrices.