Using a skin toner twice a day can damage your skin

What kind of damages can cause if there is any?

Some skin toners have harsher chemicals that can dry your skin and some skin is sensitive to this and will break out with red lines or peel or feel painful to the touch.

However, it is a personalized thing...I use Clinique toner in the morning and Clean & Clear at night (with 2% sialic acid) and have no problems.

but if it says to i guess u should.. or go on the company'z website and find out