Teeth can become discoloured in many circumstances. Usually, the staining is caused by extrinsic factors, which only affect the tooth enamel and can quite easily be corrected. However, teeth discolouration can also be intrinsic, as a result of certain medication or tooth traumas from childhood. Intrinsic damage usually results in greyish teeth.
The most common cause for extrinsic staining of teeth is food (beets, chocolate, etc.) and beverages (red wine, black tea and coffee). Smoking can also cause teeth discolouration as it can turn the teeth yellow over time.
Teeth staining can be avoided by thorough and frequent brushing of the teeth, flossing as well as less frequent consummation of such staining food and beverages.
Measurement Principles and Instruments
Teeth whitening is recorded by comparing the photo of teeth before and after the whitening treatment.
Efficacy testing protocol is prepared for each product individually with close cooperation with the sponsor. Based on the claims, usage regime and efficacy expectations, we prepare a protocol that is suitable for the type of product and can confirm product efficacy. The studies can be performed over a different time period (from a few days to several weeks or months) depending on the claim and type of measurement.