First, coffee is very acidic. This means it will directly break down your tooth enamel.
Similar bacteria can cause gum disease and even bad breath.
If you have concerns about your mouth pH, there are very few pH balanced mouthwashes that can help. Here is one.
It would be very difficult for most people to just stop drinking coffee. So, at the very least, pay attention to things you can do to balance your pH back after consuming this acidic beverage.
Rinsing immediately with water can help, at least a little bit. The use of a pH balanced mouthwash can be helpful. Chewing a 100%, sweetened with xylitol, gum or mint can also help. The xylitol amount should probably be a minimum of .72 grams per piece. You can find some here.
Some people sip coffee all day long. As you can probably imagine, this keeps a constant barrage of acidity in your mouth.
[If you hate coffee breath, try this chewing gum. ]
While the saliva can work to drive minerals back into the enamel, it will have a lot of difficulty overcoming a constant barrage of acidity. It is like a chemical reaction a neutral pH will help drive minerals in. Acidity may move things in the opposite and wrong direction.
As you can probably surmise, this can be one contributing factor to the development of tooth decay.
See the video below for commentary on 'cracked and broken teeth'.
Author: What You Should Know About Gum Disease
PS: Get your free guides on fighting gum disease and stopping bad breath
PPS: my favorite dental health machine for home use.
* I speak in general terms only. If you have specific questions about your unique dental health situation, direct those questions to your periodontist or dentist.