There appears to be pros and cons of utilizing Apple Cider Vinegar for maintaining healthy teeth.
One school of thought would lead us to believe that the worse possible thing you can do for your teeth is expose them to repeated exposure of apple cider vinegar. It's important to realize that vinegar is an acid and should be used with a certain amount of caution.
The acid in the vinegar is strong enough that it can actually erode the enamel on your teeth. If it is to be used, it has to be carefully monitored and controlled. For instance, many people believe that if they sip apple cider vinegar diluted in water though-out the day, they will be doing wonders for their overall health. However, many people have encountered serious damage to their teeth by utilizing this practice. There are recorded instances where the damage was so severe that little could be done to save the teeth. That is not to say that there are not benefits from using the mixture, it's just that it has to be modified to prevent damaging the teeth.
The best option appears to be consuming the drink through a straw and bypassing the teeth altogether, or taking in the water-vinegar mixture two or three times a day as opposed to through-out the day. It has been found that the drink should be consumed in about a five minute time frame and immediately after the teeth should be brushed if a straw is not used. That way you can prevent the acid from the vinegar from having time to have a negative impact on your teeth.
At the same time, apple cider vinegar can help promote healthy gums if used properly. Using a mouthwash of about one part apple cider vinegar to five parts water will help prevent gum disease. As a precaution however, the teeth should be brushed within 10 minutes or so of having used the mouthwash mixture.
You can also try a mixture of 3 parts vinegar to one part water and mix it with your toothpaste. Brushing with this mixture is an extremely effective way to whiten your teeth. Right after using the vinegar, water, toothpaste mixture, brush your teeth again with "just" toothpaste to remove any cider vinegar residue.
If used properly, apple cider vinegar can have a positive effect on the health of your teeth and gums. The secret is to not let the acid from the vinegar have time to erode the enamel on your teeth.