For Muslims, using tooth paste to brush one’s teeth while fasting during the month of Ramadan (from sunrise to sunset everyday) is not permitted. Islamic scholars have advised that Muslims can use a twig stick to brush their teeth while fasting but they must ensure that they do not swallow the saliva thus generated.
Deccan Chronicle Jamia Nizamia chancellor Syed Akbar Nizamuddin said using toothpaste is “makrooh” during fasting as it has sweetness, mint and other flavours and ingredients. Also, there is a possibility of the paste going down one’s throat, which, if it happens, results in invalidation of the Roza. Hence, it is advisable not to use toothpaste.
Mufti Azeemuddin of Dar-ul-Ifta said women are allowed to taste the food while cooking only to know the content of salt or spices while fasting but if they eat then their fast would be invalidated. This permission to taste is allowed only in rare cases wherein the husband or head of the family is very particular about the taste of food and there are chances of him resorting to physical punishment of the woman.
Of course, if you feel the need to have your teeth polished during Ramadan, you can always go to your local auto body shop.