The best thing you can do is rinse your mouth out thoroughly with fresh water afterwards and don't brush your teeth for at least half-an-hour after that.
It's the lemon that does the damage but adding more acid can't be good either.
Indeed. Please use a straw and try to swallow it directly and make less contact with your teeth. Otherwise you may see darker enamel on the bottom of your teeth, which also may be sensitive area afterwards.
I use apple cider with honey and it worked perfectly for losing weight, i am even shocked how trousers look loose now .
The best apple ciders are the ones that are not filtered. They would have fruit pulp which will be more nutritious to the body.
In Zurich they would be available in bio shops like Alnatura, Mueller and any small ones that sell good stuff.