**8. Cratoxylum formosum gum**

The gum of Cratoxylum formosum, commonly known as mempat, is a natural agent that has been used extensively for caries prevention by hill tribe people residing in Thailand. A research showed Cratoxylum formosum gum has high antimicrobial activity against S. mutans and may become a promising herbal varnish against caries (Suddhasthira et al 2006).
