Evaluation of Toothpaste

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Chapter: Textbook of Cosmetic Formulation : Toothpastes

The quality control studies and evaluation tests are necessary in order to check the purity, consistency and efficiency of the product. The specific evaluation tests for dentifrices are as follows:


EVALUATION OF TOOTHPASTE

 

The quality control studies and evaluation tests are necessary in order to check the purity, consistency and efficiency of the product. The specific evaluation tests for dentifrices are as follows:

 

 

1.           Tests For Abrasive Character:

 

The cleansing action of dentifrices mainly depends on their abrasive property. The abrasion should not lead to any damage to the enamel and hence the test for checking the abrasive property has been done on the extracted teeth. The teeth are brushed by mechanical means with paste or powder and the effect of dentifrices on the teeth is studied by comparing the results before and after brushing.

 

 

2.            Determination Of Particle Size:

 

Particle size determination is important as the cleansing nature and abrasive property of the dentifrice mainly depends on the particle size. The particle size can be determined by using microscopical techniques or by involving the method of sieving.

 

 

3.          Test For Cleansing Property:

 

This test is done in order to determine the cleaning ability of the dentifrice. The tooth cleansers such as powders and pastes are brushed onto a polyester film and the change in reflectance character of the lacquer coating is measured. The in-vivo method involves brushing of the teeth-with dentifrices for 2 weeks and determination of the condition of the teeth before and after brushing and comparing them by means of photographs.

 

 

4.          Determination Of Consistency Of The Product:

 

This test is done in order to determine the consistency of the product for the maintenance of its flow property all throughout its storage period. The consistency of the product mainly depends on the 'theological properties such as particle size, viscosity etc.

 

 

5.          Determination Of pH Of The Product:

 

A 10% solution of the paste in water is made and the pH of the dispersion is measured using a pH meter. The pH should be in the range of 6.8 to 7.4 in order to maintain the consistency of the product.

 

 

6.          Determination Of Foaming Character:

 

This test for the foaming character is applicable only to foaming tooth powders and pastes. In this test, specific amount of the product is mixed with a known amount of water. The solution is then shaken sometimes in order to produce foam. The foam produced is then collected and studies on its nature, washability and stability are carried out.

 

 

7.    Determination Of The Volatile Matter And The Moisture Content:

 

This test is done in order to determine the amount of volatile matter and moisture content in the product. In this method, a specified amount of the product is taken and is kept for drying till a constant weight is obtained. The weight of the product before and after drying is measured and the loss in weight is calculated which determines the percentage of moisture content and volatile matter.

 

 

8.           Determination Of The Test For The Special Ingredient:

 

The use of therapeutic ingredients may lead to certain incompatibilities and hence specific tests are done in order to determine the effect of the specific ingredients such as antiseptics, enzymes etc.

 

 

9.            Limit Test For Heavy Metals:

 

The test is done in order to check the presence of any heavy metals such as arsenic and lead which may lead to toxicity. The occurrence of these metals can be avoided by carrying out the limit tests for heavy metal, for raw materials, which may reduce usage of these materials.

 

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