These white and regular dots on the photo are caused by the rollers of the camera. In order to spread the chemistry between the negative and positive part of the photo, the picture goes through the rollers. If they are dirty, the chemistry won’t be spread correctly and these marks will appear.
In order to avoid this issue, make sure that the rollers of your camera are clean.
They are accessible by opening the film compartment. You can easily clean them with a soft cloth and some water. We recommend you to check the rollers of your camera after each pack of film used.