4 doctors weighed in:
Which is best sunblock available which protects whole day? Is it necessary to buy new sunblock every year?
4 doctors weighed in

Dr. Jeffrey Pollard
ENT - Head & Neck Surgery
2 doctors agree
In brief: Zinc / Titanium
Sunscreens work via 2 possible ways: 1) chemical blocks that breakdown the uv rays as they pass through the skin and 2) physical blocks that prevent the uv rays from getting to the skin.
I recommend the physical blocks (zinc and titanium) because they have a very good safety profile and work very effectively. If you are going to be in the sun - use a minimum of spf 15 - follow product directions.

In brief: Zinc / Titanium
Sunscreens work via 2 possible ways: 1) chemical blocks that breakdown the uv rays as they pass through the skin and 2) physical blocks that prevent the uv rays from getting to the skin.
I recommend the physical blocks (zinc and titanium) because they have a very good safety profile and work very effectively. If you are going to be in the sun - use a minimum of spf 15 - follow product directions.
Dr. Jeffrey Pollard
Dr. Jeffrey Pollard
Thank
Dr. Brock Ridenour
Surgery - Plastics
In brief: Must reapply
Sunscreens are designed to be stable about 3 years.
Look for products that have micronized zinc oxide and titanium dioxide. Broad-spectrum physical blocking agents protect against both uva and uvb rays without harmful chemicals. Use a minimum spf 30, (remember spf applies only to uvb rays), apply 20-30 min before you leave the house, apply 1 ounce for the entire body, and reapply every 2-3 hour.

In brief: Must reapply
Sunscreens are designed to be stable about 3 years.
Look for products that have micronized zinc oxide and titanium dioxide. Broad-spectrum physical blocking agents protect against both uva and uvb rays without harmful chemicals. Use a minimum spf 30, (remember spf applies only to uvb rays), apply 20-30 min before you leave the house, apply 1 ounce for the entire body, and reapply every 2-3 hour.
Dr. Brock Ridenour
Dr. Brock Ridenour
Thank
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