I asked Ayesha, "What was the first thing the Messenger of Allah ﷺ would do when he entered his house?"She replied, "He would use the tooth-stick."
حدثنا وكيع قال حدثنا سفيان
قلت لعائشة بأي شيء كان رسول الله ﷺ يبدأ إذا دخل بيته قالت بالسواك
Its isnad is sahih, mentioned previously at 25430.