Everyone agrees that one of the best things about eyelash extensions is the huge variety of sizes, thicknesses and curls on the market – there's so much to customize and make each job unique! It is important to have several alternatives to be able to adapt the possibilities of the Technique to the needs of the client and allow that, in the end, both are satisfied with the work. It is understandable that
the wide range of varieties that exist on the market can become a little confusing and it becomes difficult to understand all the differences in order to make the best choice possible.
Whether you're a beginner or more experienced, it's important to always stay focused and willing to learn more, so we leave you with a little explanation about the main differences between C and D curvatures and how they can work for your client. Although there are other curvatures on the market (J,B,CC,L...) these are the most popular and versatile, so it's important that you understand how you can best use them.
Curvature C
One of the most popular and also one with the most variety of uses, the C-curl is a very valid option for most eye shapes. C-curl lashes are more curved than B-curl lashes, and have an extra 'feel' at the end of the lash that helps create a wider, more open look.
Depending on the thickness and length, C lashes can be used to create a more natural or more dramatic look, depending on what your client wants. If you're going to serve someone who doesn't know what they want or who's undecided, the C curve is a great middle ground.
Curvature D
Being a more curved option than the C lashes, the D curl is intended to be almost half-moon shaped. D eyelashes are perfect for those looking for a bolder and more prominent look! However, due to its semi-circular shape, there is less extension length to stick to the natural lash which makes retention a little difficult.
Be careful when using the D-curl on those who have naturally large eyes, as it can create a scared look or sunken eyes because the lashes will likely touch the eyelids and can cause discomfort or even irritation.
And still...
There is always the possibility of mixing the curves to create a different effect, especially if you want to opt for a more gradual style. It is very important to respect the shape of the client's eyes and be careful to never let the eyelashes hit the eyelids or glasses!
If you're always looking to do better, don't be afraid to try different combinations, keep up to date and look for training and quality materials! 
