Please capitalize where necessary: if left untreated, permanent damage to the brain and heart can follow.
A: If left untreated, permanent damage to the brain and heart can follow.

Please capitalize where necessary: linux software still has very experimental cmyk features.
A: Linux software still has very experimental CMYK features.

Please capitalize where necessary: for exterior plastic and rubber the recommended mixing ratio is between 1:10 and 1:1. a mixing ratio of 1:1 is recommended for the 'wet wet look'.
A: For exterior plastic and rubber the recommended mixing ratio is between 1:10 and 1:1. A mixing ratio of 1:1 is recommended for the 'Wet Wet Look'.

Please capitalize where necessary: lapis lazuli makes the immune system stronger and helps to balance the thyroid
A:
Lapis lazuli makes the immune system stronger and helps to balance the thyroid