Can I Use Miswak and Toothpaste Whilst Fasting?

Answer (beginning)

الُجوابُ بِعوُنِ الُبلِكِ الُوفِّابِ اللّهُمً هِدایةًالُحقِ والصّوابِ It is permissible to use all kinds of Miswaks whilst Fast is not nullified by it, rather, miswak is sunnat whilst fasting, just as it is Sunnah in the other days, but bear in mind, that if a person remembers that he is fasting and the bristles of miswak breaks upon chewing it or the taste is felt, then one should avoid chewing it Moreover , although toothpaste is not impermissible and Haram Iprohibited ] when fasting, but using it without a valid need, is certainly Makrooh and because there is more likelihood that some bits…

This is only the beginning of the answer. Read the complete fatwa, with all its references, on the Darul Ifta Ahle Sunnat website.