Whenever Allah's Messenger (ﷺ) entered his house, he used tooth-stick first of all.
Sahih Muslim Book 2, Hadith 58
← Previous Hadith I asked A'isha what Allah's Apostle (ﷺ) did first when he entered his house, and she replied: He used tooth-stick (first of all).

Sahih Muslim Book 2, Hadith 57 Next Hadith → I went to the Apostle (ﷺ) and found one end of the tooth-stick upon his tongue (i. e. he was rinsing his mouth).

Sahih Muslim Book 2, Hadith 59