Did you know that 80% of aging in women is photoaging, that is, UVA in ultraviolet rays? Therefore, when buying sunscreen, you must have the PA+ logo, which can resist UVA!
Also, don't think that you are only a teenager, and you are still far from aging. In fact, if you can't apply sunscreen every day now, you will have wrinkles in your twenties or early thirties. If you start applying proper sunscreen every day now, you will age many years later than others. Maybe when you are 40 years old, your skin is still firm and elastic without wrinkles! So, pay attention to sun protection! ! !
Of course, sunscreen needs to be applied every day, whether it is spring, summer, autumn and winter, sunny or cloudy. SPF30 sunscreen is usually used in summer, and SPF 15-25 is enough in rainy days. Don't be afraid of trouble, you will feel that your efforts are valuable after many years ~ ~ ~
Of course, military training should be coated with sunscreen. If you buy SPF30, it is generally enough. The instructions say that painting every 3-4 hours is the bottom line. Because sweat will wash away your sunscreen, it's useless. It's best to apply it every two hours, just have a rest.
The 100 ml you bought is definitely enough, don't worry ~ ~ ~
I can type it word by word. I hope it helps you. If you don't understand anything, you can keep asking me ~ ~ ~