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Answer

Of

Of here signifies the cause why a particular event did or did not occur.

Answer

White is the best reflector of light and heat where as black is the best absorber of light and heat. As we move from white spectrum to black spectrum the intensity of absorbing light and heat increases and the of course the reflector power of the color reduces. Therefore in summer days it is always advisable to wear light colored clothes and white is the best choice amongst all the colors.

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Oral hygiene implies taking good care of your teeth. It includes brushing your teeth twice daily - morning and night. You should also clean your mouth after every meal so that food debris are not stuck between your teeth. It is also important to floss your teeth with a thread. You must visit a dentist every 6 months and get a regular check-up. If oral hygiene is not maintained some common diseases like gingivitis, tooth cavity etc can occur.