| | Dental Health | Cavities What is halcium? Halcium is not a recognized term or a known element or substance. There is no information available on anything called halcium. It appears to be a made-up or non-existent term. Cavities - Related Articles What is indentation of the thecal sac? How to Detect and Prevent Cavities What does a cervix weigh? Is the spinal cavity a ventral body cavity? How soon do you need to fix a cavity? Can you keep a tampon once its been opened? When and how to use a period?