The miswak (miswaak, siwat, sewak) is a teeth cleaning twig made from a twig of the Salvadora Persica tree, also known as the arak tree or the peelu tree. Studies indicate that Salvadora persica extract is somewhat comparable to other oral disinfectants and anti-plaque agents like Triclosan and Chlorhexidine Gluconate if used at a very high concentration.

Refereces: A 2003 scientific study comparing the use of miswak with ordinary toothbrushes concluded that the results clearly were in favor of the users who had been using the miswaak, provided they had been given proper instruction in how to brush using it. The World Health Organization (WHO) recommended the use of the miswaak in 1986 and in 2000 an international consensus report on oral hygiene concluded that further research was needed to document the effect of the miswak.