Which of the following element is responsible for tooth decay in children when present in excess?

Tooth decay in children, often referred to as dental caries, is primarily caused by the presence of sugars that lead to the growth of harmful bacteria in the mouth. However, if we are considering an element that is related to tooth decay, it is important to mention fluoride.

While fluoride can help in the prevention of tooth decay when present in proper amounts, excessive fluoride intake can lead to a condition called dental fluorosis, which affects the enamel of the teeth and can lead to decay.

Nevertheless, in terms of elements that go beyond just fluoride, sugar (not an element but relevant to the context) is a significant factor. Excessive sugar intake is largely responsible for fostering an environment where decay-causing bacteria thrive.

In summary, when thinking of elements specifically associated with tooth decay, fluoride (in excess) would be the primary element to consider, while sugars are a major dietary contributor to the decay process.