It is narrated from Sayyiduna Tamam bin Abbas (may Allah be pleased with him) that when people came to the Noble Prophet (peace and blessings be upon him), he said: "What is the reason that you have come to me in such a state that there is filth and yellowness visible on your teeth? Use the miswak. If there had not been a fear of hardship upon my ummah, I would have made the use of miswak obligatory like wudu."