system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 - Why do our mouths produce that little bit of saliva before we have something sour?
gpt
Because the extra water diluted the acid. The taste of sour is acid. Doesn’t matter if it is citric or hydroflouric. They will all produce a sour flavor. The acid can destroy your teeth and damage your flesh so having it be more dilute is a huge help when dentists don’t exist yet.