It is most common for root resorption to begin on the outside of a tooth near the gum line and work its way inward in a process called external cervical resorption (ECR). Pink spots are a common indicator that ECR is taking place. The eventual effects appear as holes, or cavity-like areas, at the gum line of the tooth.nnNot nearly as common as ECR, internal resorption begins in the root of the tooth and is often due to chronic pulp inflammation. Because resorption is usually asymptomatic, most patients are unaware of their condition until well into the resorption process.