The substance that is located between the tooth's enamel surface and underlying root.
Tooth wear caused by physical (as opposed to chemical) means. People who 'scrub' their teeth aggressively may show signs of abrasion.
pH is a measure of how acidic or alkaline a substance is. The pH scale ranges from 1 to 14, with 1 being very acidic, 7 - neutral and 14 - very alkaline.
This describes the loss of tooth enamel.