Deciding whether or not to cut your hair is a personal decision that's different for everyone, and there's no right or wrong answer. While you're trying to decide, spend some time looking in the mirror, thinking about how your hair would look if you cut it. Play with your hair in the mirror, too–hold it up so the ends hit at a shorter length than normal, or flip the ends of your hair over your forehead so they look like bangs. This can help give you a rough idea of what you would look like with a new cut. If you're thinking about cutting your hair, flip through pictures where you have different hairstyles, if you have any. Pay attention to how different cuts framed your face, and think about what you did and didn't like about your hair at the time. Another thing to look for is how different haircuts looked when you styled them yourself. For instance, if a cut looked great on you right out of the salon but you had trouble taming your curls at that length, pictures can help remind you. There are a number of apps and websites that will let you upload a picture to try on different haircuts. This is a fun way to experiment with different lengths, styles, and even colors to see what you like. You might even discover a cut that you would never have considered before!  When you're taking a picture to upload to one of these apps, pull your hair away from your face and look straight into the camera. This will help ensure the sample hairstyles are aligned properly with your face. If you don't have a way to take a picture of yourself, most of these apps will let you try hairstyles on a model's face. Try to pick a model whose face shape most closely resembles yours. Take a screenshot or print out a photo to show to your hairdresser if you find a style you really love. Hold a pencil directly under your chin, extending out toward your ear, then hold a ruler perpendicular to the pencil and measure the distance between the pencil and your ear.  If the distance between your ear and your chin is less than 2.25 in (5.7 cm), your...

===
Write a summary of the previous text in Vietnamese:
Soi gương và tưởng tượng các kiểu tóc khác nhau. Xem lại những bức ảnh cũ của bạn với các kiểu tóc khác nhau. Sử dụng một ứng dụng để thử những kiểu tóc khác nhau. Đo khoảng cách giữa tai và cằm để xác định xem kiểu tóc ngắn có thích hợp với bạn không. Chọn kiểu tóc ngắn nếu bạn sống ở nơi có khí hậu nóng, ẩm. Chỉ nên cắt tỉa tóc nếu bạn muốn tạo ra những thay đổi to lớn trong cuộc sống. Đừng cắt tóc chỉ vì ai đó yêu cầu bạn.