If you finish the day without a sunburn or an obvious tan, your answer is probably "effective." But, if you are putting on sunscreen at the beginning of the day without reapplying every three to four hours, then you are, in fact, overexposing your skin to the sun.
Or, if you're going out the beach, your SPF may not be high enough to be effective. Here's the thing: premature aging from UV damage occurs from a lack of exposure over time. And, the only way to avoid wrinkles and fine lines is by making sure that your protection lasts throughout the day.
Tarte Tarteguard 20 Tinted Moisturizer Broad Spectrum SPF 20 Sunscreen, $36
Coola Makeup Setting Spray SPF 30, $36
Article continues below
Amore Pacific Sun Protection Cushion Broad Spectrum SPF30, $40