What does NOT break the fast?
Eating or drinking by mistake out of forgetfulness does not break it — complete your fast. Waking up in a state of janabah does not break it either; take the bath and fast. Brushing teeth carefully without swallowing water is also fine.
Evidence
إِذَا نَسِيَ فَأَكَلَ وَشَرِبَ فَلْيُتِمَّ صَوْمَهُ، فَإِنَّمَا أَطْعَمَهُ اللَّهُ وَسَقَاهُ
Narrated Abu Huraira:The Prophet (ﷺ) said, "If somebody eats or drinks forgetfully then he should complete his fast, for what he has eaten or drunk, has been given to him by Allah."
يُدْرِكُهُ الْفَجْرُ وَهُوَ جُنُبٌ مِنْ أَهْلِهِ، ثُمَّ يَغْتَسِلُ وَيَصُومُ
Narrated `Aisha and Um Salama:At times Allah's Messenger (ﷺ) used to get up in the morning in the state of Janaba after having sexual relations with his wives. He would then take a bath and fast.
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