It's generally best to apply a Ubtan in the evening, before bedtime. This is because face packs can take some time to dry, and you don't want to have to go about your day with a wet or drying face pack on your skin. Additionally, your skin repairs and rejuvenates itself while you sleep, so applying a face pack before bedtime allows it to work its magic overnight. It's also a good idea to cleanse your face before applying a Ubtan to ensure that your pores are free of dirt, oil, and makeup, which can help the face pack to work more effectively.
it is important to follow the instructions on the package, and to start with a small amount to see how your skin reacts. You can gradually increase the frequency of use as needed.