It is recommended that all hamsters have access to a sand bath, unless a medical condition would prevent this for some reason.  Some hamsters may use sand baths to clean themselves, which helps to keep their fur looking shiny and healthy as it removes any excess oils.  Other hamsters may use it to go to the toilet in (which can make spot cleaning easy), and others may use it for both these things or not at all.  Contrary to some information online, it is perfectly safe to let a hamster have access to a sand bath 24/7, as it doesn't damage their fur in the same way it can with other animals, such as chinchillas.

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 What type of sand to use?

A calcium and dye free sand should be used, as the calcium can clump together and cause internal blockages and the dyes can cause respiratory irritation.  Chinchilla dust or powder should also be avoided, as these are far too dusty and can also cause respiratory issues.  Some reptile/desert sands are safe to use; my personal favourite is the Komodo Natural sand. Some people find using big packs of children sand more economical but it will need to be cooked to ensure it's sterilised and dry.  Some brands may need sieving, to remove any larger coarser sand.​​