D curl lashes are very similar to C curl lash extensions but curlier. This type of curl is used to create a more dramatic effect for the client’s eyes. They are suitable for clients with downward-angled lashes. Undoubtedly, this curl will widen their eyes and give them a noticeable curled effect.
Because D curl is considered as a dramatic upward curl, it can not be used for clients who have upward-angle natural lashes, heavily hooded eyelids, deep-set and droopy eyes. If lash artists use D curl in these cases, the extensions can end up brushing against the upper eyelid, causing irritation or at least annoyance for your clients.