Question

sweet tooth paste may lead to toothpaste decay explain why

Answer 1

When something sweet sticks to our teeth, it attracts the bacteria which tries to digest it secreting acid in this process. This causes it to damage the enamel. 

Answer 2

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