Dentine
/ˈdentɪn/
Definition 1 of 1
Pro Tip 1/3Tooth Layers
Understand that 'dentine' refers to a layer of the tooth, specifically the one between the enamel and pulp. 
The dentist explained that the cavity had reached the dentine.
Pro Tip 2/3Sensitivity Context
'Dentine' is often mentioned when discussing tooth sensitivity, as exposed dentine can lead to discomfort. 
He used a special toothpaste designed for exposed dentine to reduce sensitivity.
Pro Tip 3/3Dental Health
In dental health discussions, 'dentine' indicates a key part of tooth structure susceptible to decay. 
Cavities can penetrate the enamel and attack the dentine.