the pain was the most common reason for dental visits 

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 chronic childhood disease,6 dental caries—and its complications—is the most frequent cause to seek dental care for a child.7 

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great value for pediatric dentists to prevent and treat dental caries properly and optimal restoration of the morphology and function of primary teeth is in need to maintain and improve the oral health condition of young children in clinical practice. 

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 tooth pain, directly leads to decrease in mastication or asymmetric mastication,11 changing the distribution of functional occlusal contact. Long-term unilateral mastication may lead to compromised facial growth and development, resulting in malocclusion and dental-facial deformities

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caries cavitations in primary teeth may retain food debris and change the oral microenvironment

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Researchers pointed out that severe caries experience during early childhood could result in a more severe caries experience during adulthood while a caries-free primary dentition has a greater likelihood to remain caries-free in the permanent dentition.18,19

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Disintegration of the primary tooth crown from severe caries may lead to malnutrition since dental status can affect masticatory function, food preference and dietary intake, relating to developmental delays

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