I hear that coffee is lower on pH than tea but I put milk in coffee which increases it by how much? When I make black tea I brew 5 minutes not 2 or 3 they say it increases the pH increases drastically. I was wondering what the pH level of my tea is if I make it double strength and five minute brew. I drink that lapsong black tea I don't know if that has a higher pH and then the pH of english breakfast, earl grey black tea and other black tea. I'm having some pretty serious tooth decay and wanting to help it they say tea is good for it but if I double strength of mind will it melt my enamel. I want to make mine double strength but what is the pH and will it hurt me.