Excuse me ! How many times a day do you have to apply sunscreen? The effect is good

Looking at how high the SPF of sunscreen is, under normal circumstances, SPF 15 seems to be more than an hour.

1. When buying sunscreen, pay attention to the SPF value, which is to protect against UVB rays. The higher the SPF value, the better, the higher ** the more difficult it is to "breathe", some people will have allergies, and the use of SPF in Guangzhou is only 15 to 25 is enough. When choosing sunscreen products, you should also pay attention to preventing UVA rays, which are represented by PA, and the more plus signs, the better the sunscreen effect.

2. When to apply sunscreen: Arrange to apply it 15 minutes before going out, because the sunscreen will only work after 15 minutes after rubbing.

3. All parts of the body should be rubbed, especially in places with strong ultraviolet rays.

4. Apply sunscreen to the back of your hand and sprinkle it with water, it is best to pick one that can form water droplets.

It depends on the SPF of the product you buy and the amount of time you spend outside in the sun. If the sun protection index is high, it is generally enough to wipe it once a day, so if the index is low, it is necessary to wipe it several times.

Hello, Know Me Cosmeceutical Skin Consultant is happy to help you.

Make up the application according to the SPF of the sunscreen you wear. Different SPF values indicate different amounts of time for effective sun protection. Specifically:

SPF 15 = 15 * 10 = 150 minutes.

SPF 20 = 20* 10 = 200 minutes.

SPF 30 = 30 * 10 = 300 minutes.

SPF 50 = 50* 10 = 500 minutes.

It depends on the length of time you spend outside, usually every two or three hours.

1. What light sources exist in the ultraviolet rays of sunscreen?

In general, there are two main ultraviolet rays we are talking about, one is ultraviolet rays in nature, and the fundamental ** is sunlight, as long as there is sunlight shining or sunlight refracted and reflected to the place, there will be ultraviolet rays, such as outdoor, outdoor, window; The other** is the ultraviolet rays emitted by man-made devices, such as sterilization cabinets and medical instruments.

Many people are worried that indoor light sources and devices with electronic screens also have ultraviolet rays, in fact, the wavelength of artificial light sources can now be controlled by technical means, which will not produce ultraviolet rays and will not emit ultraviolet rays from electronic screens, but the presence of electromagnetic waves around mobile phones and computers is unavoidable, and there is no Internet access without electromagnetic waves.

So: there is no need to use sunscreen under indoor light sources; Theoretically, when receiving sun exposure, you need sunscreen measures, or even sunscreen, but whether it is necessary or not depends on the intensity of sunlight, the duration of sun exposure, and your own metabolic repair.

2. Under what circumstances can I do without sunscreen?

If you stay indoors every day without sunlight, even if you are in an environment with strong artificial light sources, you don't need to wear sunscreen. Of course, this does not mean that you can be lazy in skin care, stay in strong light for a long time, or face the computer screen for too long, ** is more likely to be dehydrated and dry, and you still need to pay attention to hydration and moisturizing.

If you have only a small amount of direct exposure to sunlight every day, and rarely bask in the sun through the glass by the window, no more than 15 minutes, you can also not wear sunscreen, whether from the perspective of preventing tanning or preventing excessive aging, the metabolism itself is enough to repair and offset the short-term exposure.

If you spend more than half an hour a day exposing yourself to direct sunlight or getting sun exposure through glass, it is necessary to use sunscreen. For a short period of time or in winter when UV intensity is low, a low sunscreen is sufficient; For example, if you stay outdoors, take a vacation at the beach, travel to the plateau, and use high sun protection in a living environment with high UV intensity and long sun exposure time, or in the summer when UV rays are strong.

3. Sun protection is very important, but there is no need to overdo it.

From a health point of view, sun protection is sun protection in high-intensity ultraviolet environments (long-term outdoor environments, summer seaside, plateau activities, etc.), rather than our daily work life when we spend most of our time indoors.

One application of sunscreen does not take care of a day. Sunscreen needs to be reapplied every once in a while, depending on the environment. Sunscreen can be a great sunscreen, but it's important to use it correctly in advance.

If you spend a lot of time indoors and have little exposure to the sun, you only need to apply sunscreen twice a day, and if you apply sunscreen in the morning, you can reapply it again at noon. If you are often outdoors, then you need to make up the sunscreen once every 2 to 3 hours, because the sunscreen will have an oxidation effect after exposure to ultraviolet rays, and the effect of sunscreen will also be reduced, so you must make up for it several times. If you are constantly in the pool or at the beach, you should apply sunscreen every time you come out of the pool or out of the sea.

Although most sunscreens have the function of hydration, they will still be washed off more or less, and it is better to refill them every time they come out for good sun protection. In order to get the best out of sunscreen, it is important to know how to use it correctly. Be sure to apply sunscreen well in advance before going out, preferably 15 to 20 minutes before you go out.

Applying sunscreen does not provide immediate sun protection, it also takes time to absorb. Only when the sunscreen substance in the sunscreen is absorbed can it play a role in protecting the sunscreen from forming a protective film. In order to achieve the best sun protection effect, some people will mix various brands of sunscreen together, in fact, this practice is very harmful to the **.

Because the ingredients in these sunscreens are not the same, if they are mixed together, there may be rejection and damage to the **.

Space sunscreen is applied once a day is the most appropriate to apply sunscreen several times a day.

Sunscreen is best applied several times a day.

It depends.

1. If you are often outdoors, you should apply sunscreen every two hours or so, about three to four times a day.

2. If you are often indoors, you can apply sunscreen every three to four hours or so, about two to three times a day.

3. If you are swimming, you need to reapply sunscreen after swimming.

4. If it is in a place with very strong ultraviolet rays such as the beach, it is recommended to reapply sunscreen every hour.

Sunscreen is multiple, we are not always exposed to the sun, and the sun protection factor does not need to be too high. Generally, sunscreen should be worn for about four hours at most, and it should be re-applied after four hours. As long as you go out, you should wear sunscreen every day.

It is only when you sweat and the sunscreen is washed away, the sunscreen film becomes incomplete, and the sun protection decreases, that you need to reapply sunscreen every 2 hours or so. Especially outdoor sports, outdoor sports, and long-term contact with water such as the seaside and water's edge.

situation. At the same time, it is also necessary to look at the sun protection index, high sun protection index, long sun protection duration, low sun protection index, short sun protection time, low sun protection index sunscreen needs to be reapplied many times, and sunscreen with high sun protection index does not need to be reapplied for 2 hours without a lot of sweating exercise.

Apply sunscreen every two hours.

Wearing sunscreen once does not last all day. Regular sunscreens only protect you from UV rays for about two hours, after which there is not much sun protection. Therefore, in order to prevent sunburn, aging and even cancer, you need to apply sunscreen every two hours.

Even if you're not exposed to the sun, wear sunscreen. Many people mistakenly think that sunscreen is only needed in sun-exposed places such as pools and beaches, but in fact, daily activities such as walking on the street and driving every day will expose ** to the sun, and sunscreen is also needed.

When the temperature is very hot, apply sunscreen once every 2-3 hours. If it is not very hot once in the morning. Once in the afternoon will do.