Hi how quick does smegma build up under foreskin & can it effect your foreskin opening is it safe to shower once a week in men?

Here are some...: No definitive answer could be given since the smegma production is related with the pace of desquamation which widely vary among men, along age, with individual health, etc. In general, pulling back to wash and dry once every 2-4 days should be enough. But if not well as usually expected or in doubt, see evaluation and counseling for more suitable individual need.