As with everything, there are just a few warnings. When taken in undiluted form and in excess, apple cider vinegar could over time damage the enamel on your teeth or the esophagus and stomach linings. The same goes for using topically on your skin in the same area repeatedly, the acid may cause some burning. Always ask a professional for advice when looking to add this to your health care routine! Let us know how you also enjoy apple cider vinegar’s benefits!