The key now is to be sure that you are not making any of the mistakes talked about here to be sure your sunscreen is at its most effective.
First of all, make sure you’re using a sunscreen that blocks both UVA and UVB rays.
One or the other is not enough to protect you from cancer since both have been linked to the disease.
And don’t use the leftover bottle in your cabinet that expired.
Sunscreen more than 1 year old can be less effective and reduces the amount of protection you gain from it.