How to Calculate Sun Protection Factor (SPF)
Sunblock protects your skin by absorbing and/or reflecting UVA and UVB radiation. All sun blocks have a Sun Protection Factor (SPF) rating. The SPF rating indicates how long a sunscreen remains effective on the skin. A user can determine how long their sunblock will be effective by multiplying the SPF factor by the length of time it takes for him or her to suffer a burn without sunscreen.

For instance, if you normally develop sunburn in 10 minutes without wearing a sunscreen, a sunscreen with an SPF of 15 will protect you for 150 minutes (10 minutes multiplied by the SPF of 15), and wearing a sunscreen with SPF of 45 will protect you for 450 minutes.

However, any sun protection above SPF45 does not signify added strength. A sunscreen with SPF60 does not mean it is twice as strong as a sunscreen with SPF30 but instead, is just a few percent stronger than its lesser SPF. Sunscreen that is high in SPF (SPF60 - 120) may cause clogging of pores and are not recommended for daily wearing.

A Necessary Step to Preventing Further Damage
Sun Protection should be applied early in life to prevent premature aging from occurring. A good age to start will be from 4 – 5 years old. To prevent further damage, patients are advised to wear a sunblock daily, even while indoors as home/office lighting may cause UV radiation. While undergoing Skin Renewal, patients MUST wear sun protection (SPF15 and a stronger SPF45) for added protection.