PayPal balance: If someone sent you money through PayPal or youâve sold something on eBay, you have a balance in your PayPal account. This balance is first applied to any purchases youâve made. Then, when your account has no balance, you can choose to pay by credit card.
dental ledge. 1. a band of ectodermal cells growing from the epithelium of the embryonic jaws into the underlying mesenchyme; local buds from the ledge give rise to the primordia of the enamel organs of the teeth.
Before we start to explore tooth erosion, you may first be wondering what tooth enamel is and why itâs important. Tooth enamel is a dense mineral that surrounds the crown of every tooth. Think of this enamel as the moat and your tooth as the castle. Just as a moat protects the castle from unwanted invaders, tooth enamel protects the tooth from foreign substances that can hurt it, such as sugar and acid.