Should we use creams day and night?

The appropriate answer would be yes, since day creams contain a much lower percentage of active ingredients and contain or better, should contain, sunscreen actives.

Use them at night? Well, yes, but night skin does not need UV filters nor does it benefit from the amount of active ingredients that a good night treatment takes.

Night creams usually contain more active ingredients than day creams, so night creams tend to be more expensive, and lack sunscreen factors because they are unnecessary.

Use the night cream during the day it's feasible but we would have to add a UV protective cream to compensate for the lack of filters, especially in summer, to prevent spots from appearing. Many night creams contain assets that are not suitable for exposure during the day.

The advice is that we use the treatments in an appropriate way to obtain all their benefits.