Question

Sweet tooth may lead to tooth decay. Explain, why? What is the role of tooth paste in
preventing cavities ?

Answer 1

Hello Dear !
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In our tooth there is a layer called enamel . I is indestructible . when we ate something sweet  . the molecules of sugars the reacting site attach to our teeth .

Also our teeth has some self cleansing property  which use acids to remove the food particles in our teeth large globules also simples by salivary amylase (30% digestion) .

so due to the acidic property our tooth got acidic the toothpastes are basic they neutralize the reaction so that our teeth stay in neutral state (7 pH ) . and it may not lead to tooth decay 
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Answer 2

Sweet tooth is defined as liking of food which is sweeter in taste. The role played by sweet tooth in tooth decay is simple. When you eat a lot of sugary stuff which is carbohydrates mainly, the small particles that stuck in between teeth create a hot bed for the microbes to grow that resides in your mouth. These bacteria break down the enamel of teeth and cause cavities.  

Toothpaste prevents from teeth cavities by protecting the teeth outer layer called enamel. Toothpastes which are rich in fluoride seem to be more beneficial against cavities.