I love the stuff but as mentioned it must be with the “mother” most sold in grocery stores are pasturized and kill all the benifitical stuff. This is so it looks nice and clear in the bottle for retail. you want the stuff that has crap floating in it lol. A good name brand is Braggs.
One thing to remember is that long term use can damage the tooth enamel. always rinse with water after drinking it and though its a good idea to brush your teeth afterwards, do not brush your teeth without fully rinsing out your mouth first.
I found that drinking the ACV/water solution through a straw can be a good way to bypass the teeth.