ANSWER:

If you are sure that you swallowed it then your fast is not valid, but if it is just waswas then it is valid.

I am fasting shawal and was brushing my teeth. I brushed the back of my and I had a reflex action where I swallowed some toothpaste. I felt that the reflex was coming on so I tried to spit it out quickly but I still swallowed unintentionally the toothpaste because of the reflex. Is my fast still valid?

Fasting | June 22, 2018 2:56 am
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When a woman make her fast in month of shawwal, she only need one intention for her fard fast (qadha saum of Ramadhan) then she will also get rewards of the six days of shawaal, is this true ?
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I take classes from a reputed Islamic learning centre here. When I asked my female teacher regarding the 6 Shawwal fasts, she says since I definitely intend 2 make up my Ramadan fasts b4 next Ramadan, I can fast the 6 Shawwal fasts without making up my missed Ramadan fasts (due to periods) and then make them up anytime during the yr. Is this kind of fasting allowed?