It is one of the matters of established history which do not require any narration to support it. It is known that Prophet Muhammad (sws) lost his tooth/teeth during the battle of Uhad, but how many did he lose? the exact number cannot be said with certainty:
Following are the narrations which also indicate to this fact:
https://sunnah.com/bukhari:2903
https://sunnah.com/bukhari:2911
Some narrations are in Seerah books as well, which can be read at the following link:
https://islamqa.info/en/answers/239212/why-did-the-prophet-blessings-and-peace-of-allah-be-upon-him-and-his-two-companions-flee-from-the-battlefield-and-hide-in-the-cave
As far as tooth present in Topkapi Museum of Turkey, it is believed to be the tooth of Prophet Muhammad (sws) but nothing can be said with certainty.