Although it is permissible to use a miswak of any kind while fasting, it should be kept in mind that its flavour should not be swallowed.
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دلائل:
الھندیة: (199/1، ط: رشیدیة)
لا بأس بالسواک الرطب والیابس والغداۃ والعشي عندنا.
Allah the Almighty knows best.
Darul ifta Al-Ikhlas, Karachi.