2017/08/08 at 2:49 AM

Hầu như mọi người đều biết phải chống nắng cho da, nhưng tóc cũng là phần dễ bị tổn thương và thường xuyên bị bỏ quên trong các hoạt động ngoài trời.

Khi tiếp xúc với ánh nắng quá nhiều, tóc có thể trở nên khô, xỉn, đổi màu, yếu ớt, dễ bị chẻ ngọn và xơ rối.

Tại sao điều này lại xảy ra?

Khi tia cực tím (UV) trong ánh nắng xuyên qua lớp biểu bì của tóc (lớp bảo vệ ngoài cùng của sợi tóc), các phân tử có hoạt tính cao được gọi là “gốc tự do” có thể được sản sinh.

Hiện tượng này làm tóc tổn thương theo nhiều cách:

  • Màu tóc thay đổi: Melanin, sắc tố tự nhiên quyết định màu tóc, có khả năng bảo vệ tóc một cách tương đối. Nó đấu tranh chống gốc tự do, hấp thụ và lọc các tia UV. Tuy nhiên, bức xạ UVA quá cao sẽ gây tổn thương sắc tố, khiến cho màu tóc thay đổi. Hiện tượng này xảy ra đối với mọi màu tóc, dù tóc sáng màu với hàm lượng melanin ít hơn sẽ bị tổn thương nhiều hơn. Ánh sáng mặt trời cũng khiến tóc khô, làm phai bất kì màu nhuộm nhân tạo nào hoặc khiến tóc ngả màu.
  • Tổn thương cấu trúc: Dưới tác động của các tia bức xạ UVB, các gốc tự do xuất hiện và tấn công các protein tóc, đặc biệt là keratin, vốn là gốc rễ hình thành nên sợi tóc. Dạng tổn thương này so với tác động của tia bức xạ UVA thì nghiêm trọng hơn nhiều.

Tuy nhiên, tổn thương do ánh nắng mặt trời gây ra trên tóc lại không nguy hiểm như trên da. Vì các bộ phận sống của tóc (nang, chân tóc, vỏ chân tóc và tuyến bã nhờn) nằm dưới da nên được da bảo vệ. Sợi tóc mà ta nhìn thấy là những phần không còn sự sống, vì vậy nó sẽ không bị ung thư dù cho tiếp xúc với tia cực tím. Ngay cả khi bị tổn thương, tóc cũ cũng sẽ sớm bị tóc mới thay thế.

Tuy nhiên, trong ngắn hạn, tóc bị tổn thương ảnh hưởng đến vẻ ngoài, vốn quan trọng đối với sự tự tin của mỗi chúng ta. Nếu không hài lòng với tóc của mình, bạn có thể cảm thấy bất an và không thoải mái.

May mắn thay, cũng như da dưới nắng mặt trời, mái tóc óng mượt cũng có thể được thường xuyên bảo vệ. Có thể bạn chưa biết đến các sản phẩm chống nắng dành cho tóc, vốn khá mới mẻ trên thị trường, được nghiên cứu và phát triển để lọc các tia UV và bảo vệ các sợi tóc.

Một số loại dầu gội và xả dưỡng ẩm có chứa thành phần chống nắng, một số loại dầu dưỡng hoặc xịt cũng có SPF (chỉ số chống nắng) trên nhãn mác. (Mặc dù bạn nên cẩn trọng, những sản phẩm dạng xịt có thể chứa cồn gây tổn hại cho tóc.)

Lý thuyết về tính chống nắng cho tóc vẫn còn mới mẻ, nhưng đang thu hút rất nhiều nghiên cứu trong ngành công nghiệp chăm sóc tóc. Nhìn chung, các sản phẩm chống nắng cho tóc vẫn còn chưa đa dạng như dành cho da. Khi sử dụng, bạn nên tham khảo thêm những gợi ý khác nhằm bảo vệ tóc:

  • Bạn cũng có thể sử dụng sản phẩm chống nắng dành cho da thông thường để bảo vệ tóc trước khi ra nắng (dễ sử dụng nhất là các sản phẩm dạng xịt/phun). Hãy nhớ cho kem chống nắng lên đường rẽ ngôi rồi xoa lên da đầu, nơi tóc vốn mỏng. Nếu bạn đang buộc tóc, đừng quên thoa kem chống nắng lên tai và sau gáy – những bộ phận vốn thường được tóc bao phủ.

  • Đội mũ, tốt nhất là loại có vành rộng để che mặt và được làm bằng vật liệu cho phép tóc và da đầu “thở”. Nếu tóc dài hơn, dùng khăn che để bảo vệ tóc và bên dưới thì bện hay kẹp tóc lên.
  • Dưỡng ẩm để tóc không bị quá khô. Một số chuyên gia chăm sóc tóc khuyên nên thoa  các loại dầu thiên nhiên như dầu trà hoặc các sản phẩm trị liệu bằng dầu nóng trước khi ra nắng.
  • Tóc ướt sẽ yếu và dễ bị tổn thương hơn. Nếu bạn đi bơi hoặc tắm biển, xả tóc trước với nước sạch để giảm tình trạng tóc bị khô xơ và bạc màu do chất clo hoặc muối biển; nếu tóc dài hơn thì buộc lên để tránh rối, xịt/thoa kem chống nắng. Sau khi bơi, xả lại với nước sạch và thoa kem/xịt chống nắng lần nữa.
CHUYÊN NGÀNH GIẢNG DẠY
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