dentine
/ˈdɛn.tɪ.ni/Definitions
1. noun
the hardest layer of a tooth, forming the bulk of the tooth’s structure beneath the enamel.
“The dentist examined the patient’s dentine after removing the enamel layer.”
2. verb
to become or make something hard, especially in the same way as dentine forms in a tooth.
“The new material will dentine over time, making it suitable for use in dentistry.”