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Plaque, a sticky substance loaded with bacteria builds up between teeth causing irritation to gums, swelling and leads to early bleeding. In addition, bacteria which grow unhampered produce bad breath causing social stigma. The American and the British Dental Association both recommend daily use of dental floss, in addition to brushing.
"Cavities? Even after brushing twice? Oh God! Why my child? I take all the care required for my child's oral health!" I hear exclamations to this effect from every second parent seeking dental treatment for their child. The truth is, in addition to brushing twice a day, children need regular dental care from the age of 12 months.