I was in good spirits one day and kissed (my wife) when I was fasting. I came to the Prophet ﷺ and said: I have done something serious. I kissed (my wife) when I was fasting. The Messenger of Allah ﷺ said: “What do you think if you rinse your mouth with water when you are fasting?ʿ I said: There is nothing wrong with it. The Messenger of Allah ﷺ said: “Then why (are you worried)?ʿ (Using translation from Aḥmad 138)   

هَشَشْتُ يَوْمًا فَقَبَّلْتُ وَأَنَا صَائِمٌ فَأَتَيْتُ رَسُولَ اللهِ ﷺ فَقُلْتُ صَنَعْتُ الْيَوْمَ أَمْرًا عَظِيمًا قَبَّلْتُ وَأَنَا صَائِمٌ فَقَالَ رَسُولُ اللهِ ﷺ أَرَأَيْتَ لَوْ تَمَضْمَضْتَ بِالْمَاءِ وَأَنْتَ صَائِمٌ فَقُلْتُ لَا بَأْسَ بِذَلِكَ فَقَالَ رَسُولُ اللهِ ﷺ فَفِيمَ  

[Machine] The Messenger of Allah ﷺ said to me, "Trim your fingernails, perform ablution thoroughly, and when you rinse your nose, do so excessively unless you are fasting."  

قَالَ لِي رَسُولُ اللهِ ﷺ خَلِّلْ أَصَابِعَكَ وَأَسْبِغِ الْوُضُوءَ وَإِذَا اسْتَنْشَقْتَ فَبَالِغْ إِلَّا أَنْ تَكُونَ صَائِمًا