To choose the correct sunscreen, one must be aware of the nature of the damaging agent: ultraviolet - UV - radiation. UV rays are classified into three groups:
Sunscreens mainly work by blocking ultraviolet B wavelengths which are primarily responsible for sunburn. There is however now evidence that ultraviolet A can also damage the skin. Now most sunscreens available in the UK have good ultraviolet A blocking agents in addition to ultraviolet B blocking agents.
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