Answer:
(Fatwa: 760/719=B/1430)
Doing miswak with stick of any tree or plant except bamboo plants and pomegranate is permissible:
ویصح بکل عود إلا الرمان والقصب لمضرتھما (حاشیۃ الطحطاوی علی مراقی الفلاح 67)
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
