If I were at someone's house or with a large group of people where there is only one bathroom, can I pray Shahrit before brushing my teeth? I do not know where the quote is, but I know we are not allowed to pray if not presentable. Does the same apply to teeth? Are there any sources that specifically explain the cleanliness of teeth?
The Mishna Brurah 4:9 writes "it is good to rinse out the mouth." [There are those who have the custom to rinse out their mouths before davening so their mouth is pure for prayer.] So one can extend brushing ones teeth which today is the accepted method of cleaning one's mouth.