If toothpaste does not get into the throat, then the fast is not broken. However, it would be better to use toothpaste at night and to use Siwak in the day time.
May Allah guide us to His obedience!
For more, please see these answers: <a href="/en/answers/13619" class="LinkFatwa">13619</a> ,&nbsp;<a href="/en/answers/13767" class="LinkFatwa">13767</a> &nbsp;,&nbsp;<a href="/en/answers/363474" class="LinkFatwa">363474</a> &nbsp;, and&nbsp;<a href="/en/answers/82308" class="LinkFatwa">82308</a> .

What is permitted for the fasting person

Sheikh Muhammed Salih Al-Munajjid

What is Permitted for a Fasting Person?

Does Brushing Teeth Break the Fast?

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