If you notice notching or wear on your teeth near the gums, you do not need to call your dentist right away. You can point them out at your next visit. You may want to come in sooner if the lesions are causing tooth sensitivity.
An abfraction lesion is not the same as a cracked tooth. A cracked tooth is much more serious. Deep cracks are likely to affect the inside of the tooth, the pulp. These cracks are painful. These teeth need to be treated right away.