most people will say this but however there is no team that can break Bayern Munich's dominance because even though Dortmund almost broke their dominance last season they failed and this season there is Leverkusen who will try to put pressure on Munich to break their dominance of the bundesliga title but if Leverkusen makes a mistake several times it will definitely be very easy for Bayern Munich to shift him from the top of the standings and Leverkusen opportunity to get even more superior players comes in january and we'll see if Xabi can get talented players to strengthen the team consistently.
Borrusia Dortmund and Bayer Leverkusen can actually stop Bayern Munich this season, but these clubs have tried in the past and couldn't produce excellent beneficial results. Bayern Munich have growned to become one of the strongest team in Germany and they're referred as the Giant of Bundesliga. With full capacity like Bayern Munich coach, Thomas Tuchel constantly improve his chances, winning major trophies will become more easier than expected and lesser pressure on the coach because he's dealing with world-class players who don't relent but captures good scores in league games.
Not sure about Dortmund that they can do anything with Bayern this season. Their last meeting ended with a complete capitulation of Dortmund and they have a big gap in the standings now. I think Stuttgart or Leipzig have a better chance. Although, of course, Bayer are clear favourites for now.