Two Types of UV Rays:
The first one is UVA, and the other is UVB rays.
UVA rays cause the skin to age. They penetrate deep into the dermis where they damage the collagen that makes skin elastic and smooth resulting in wrinkles. First 
UVA rays also indirectly damage DNA and, they generate free radicals as reactive oxygen species which in turn cause DNA mutations.
2nd UVB rays damage the DNA in our body and cause sunburn. Skin cells damaged by UVB rays trigger an inflammatory reaction, which is the cause of the sunburn’s redness. On the other hand, UVA and UVB rays can gather up and cause skin cancer in bodies.
Sunscreen Protects the Skin from UVA and UVB Rays.
It contains UV filters which form a protective layer over the skin. This protective layer protects the skin from UV rays by absorbing or reflecting UV rays.
Three Common Myths About Sunscreen:
1) Waterproof sunscreen is more effective. There is no such thing as water-resistant sunscreen. FDA made it illegal to claim sunscreen was sweatproof, water resistant, or instant protection.
2) The higher the SPF the better the protection, it’s not true. Sunscreen with SPF 30 protects against 97% of the UVB rays. Most of the products do not live up to their SPF claims. Don’t be afraid to research your favorite brand.
3) Sunscreen lotions work better than sunscreen sprays. No, when used correctly lotions, sprays, and oils all work equally well.
Types of Sunscreens:
One is a physical sunscreen and the 2nd one is a Chemical sunscreen. The key difference between these two types of sunscreens lies in how they block rays.
Physical Sunscreen:
It is usually referred to as Mineral sunscreen and it sits on the surface of our skin and acts as a shield. They create a physical barrier on the skin and shield it from the sun’s rays. They deliver broad-spectrum protection by reflecting UV radiation away from your skin. Furthermore, they also ward off UVA-related skin damage like wrinkles and hyperpigmentation.
Most of the mineral sunscreens are developed with titanium oxide and zinc oxide. These two ingredients are recognized as safe and effective by the Food and Drug Administration. Physical sunscreen has many benefits they can be chalky and difficult to spread. Most glaringly they tend to leave behind a noticeable white cast to the skin. Especially if you have a darker complexion also aren’t always as water resistant.
Tinted Sunscreen:
Tinted sunscreen is a type of physical sunscreen that has added pigments or colors to match a range of skin tones. This type of sunscreen has several advantages over normal sunscreen, tinted sunscreen can provide better coverage than normal sunscreen. The added pigments help to even out skin tone and hide imperfections reducing the appearance of Fine Lines blemishes, and redness.
This can simplify your daily skincare routine and save you time and money on additional makeup products instead of applying sunscreen and then having to apply foundation or other makeup products separately tinted sunscreen can do both jobs at once.
Mineral sunscreens:
Often leaves a white cast on the skin which can be especially noticeable on darker skin tones this is because most sunscreens contain minerals like titanium dioxide and zinc oxide, tinted sunscreen on the other hand Blends in with the skin tone and don’t leave a noticeable residue this can be especially helpful for people with darker skin tones who want to avoid the Ashe or chalky appearance.
Tinted sunscreen typically lasts longer than normal sunscreen, which can wear off or require frequent reapplication throughout the day this is because the added pigments in tinted sunscreen help to form a barrier on the skin that can help to protect it from the sun’s harmful rays.
Chemical Sunscreen:
These chemical UV filters include oxybenzone oxalate, oxybenzone octinoxate, octocrylene, and Homo Saline. In most cases, chemical sunscreens will not leave a visible film layer on your skin. Chemical sunscreens go into your skin and act more like a sponge. Chemical sunscreens do not stay on the skin or block rays. They include active ingredients that absorb UV rays before they get into your skin. 
Most people are unsure if chemical sunscreens are safe. Because of the ingredients used the same ingredients that absorb so well pose health concerns. One major drawback of chemical sunscreens is that people with sensitive skin may experience an unwanted reaction, such as redness or inflammation. Some ingredients could exacerbate skin conditions like rosacea and plasma.
How to Apply Sunscreen Correctly:
–Always use a tablespoon of sunscreen for the face and neck separately.
-Dab tiny dots all over your face and neck and gently tap in.
-Tapping makes the sunscreen get absorbed into the skin quickly.
-Don’t forget to apply sunscreen behind your ears.
-The neck is as important as the face.
-Always message the product upwards.
If you’re most of the time remain indoors and not exposed to much sunlight you can only apply once a day. There’s research in Thailand that shows office workers applying sunscreen only once a day at the end of 8 hours 70% of the sunscreen is still on. That means your SPF 50 after 8 hours drops to roughly about SPF 30 to 35, however, if you are exposed to excessive UV rays during the day or you have a high risk of skin cancer, please reapply sunscreen every 2 to 4 hours.
