The miswak (miswaak, siwak) is a natural toothbrush

What is MISWAK? Never heard of it. And by "bicarb" to you mean baking soda...like Arm & Hammer?
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Hello, CJ.

According to Wikipedia, a "miswak is typically made from the twigs of the Salvadora persica tree growing in the Middle East. Other tree types that are used are the arak tree, peelo tree, olive, walnut, and other trees with bitter roots. Pomegranate twigs are never used for miswak."

Btw, Wikipedia and some other sources will say that it is of the Muslim culture - that is rather biased to id a specific religious sect for a plant that is indigenous to the Middle East. It is rather like saying grape vines are of the Christian culture.

"Bicarb" is bicarbonate of soda, or commonly called baking soda, such as marketed by Arm & Hammer.