Since this is a powder, it is applied differently from toothpaste. You typically wet your toothbrush, dip the bristles into the powder, and then brush. The fine particles work mechanically to lift surface deposits, while the herbal ingredients distribute across your teeth and gums during brushing. Many people find the astringent sensation from the alum and salt gives a feeling of tightness on the gums, which some prefer for a feeling of thorough cleansing.
The powder format can be chosen by those who want a longer contact time of herbal extracts with oral tissues, as it doesn't rinse away as quickly as a foamy paste. If you have sensitive teeth or gums, you may want to start with a very small amount mixed with your regular toothpaste to see how your mouth tolerates it. It is not intended to replace a balanced diet or professional dental care.