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Your skin needs a certain amount of oil to stay waterproof and resistant to infection.  Too little oil and you have dry skin (which can lead to problems with wrinkles); too much oil and youve got an oil slick and probably acne.

pH is measured from 1 to 14; 7 is neutral, 1 - 6.9 is acidic and 7.1 - 14 is alkaline.  The reason 5.5 is optimal?  You want your skin to be able to be resistant to harmful bacteria, right?  Between 4 and 6.5 is where you want to stay.


When you use a facial cleanser, dont use a body bar/soap/cleansing gel on your face, you tend to strip the acid mantle - especially with whats mass produced for grocery and drug stores.  Your skin is the first line of defense against all those microorganisms, wind, and pollution.  By using your toner you bring your skin back to where its supposed to be, so yeah its pretty important.

Follow up with a moisturizer.  Simply reapply instead of opting for a higher number.  And using one skin care line (cleanser, toner, moisturizer) is a good idea.  They are formulated to work together.