How Teeth Work: Enamel, Dentin and Pulp
Knowing a few basic parts of a tooth can make dental explanations easier to follow. Different tissues have different jobs, and a problem at the surface is not the same as a problem inside a tooth.
Enamel protects
Dentin supports
Pulp is living tissue
Understanding your care
The parts you hear about
The anatomical crown is the part normally visible above the gum. Enamel covers it. Dentin lies beneath enamel and also beneath the root covering, called cementum. Pulp is the soft inner tissue; root canals are the spaces through the roots that contain that tissue. Supporting bone and the periodontal ligament help hold the tooth in place.
Why decay develops
Some mouth bacteria use sugars and starches to produce acid. Repeated acid exposure can remove minerals from enamel. Saliva and fluoride help replace minerals, but continuing mineral loss can eventually lead to a cavity. Early decay may have no symptoms.
Can enamel repair itself?
There is an important distinction: minerals can be restored to an early damaged area before the surface breaks down, but a formed cavity or worn-away piece of tooth does not simply regrow. Ask whether a finding is an early lesion that can be managed preventively or damage needing another approach.
Why a tooth may feel sensitive
Exposed dentin can allow cold, heat or other stimuli to reach sensitive structures. Sensitivity has more than one possible cause, so it does not establish a diagnosis on its own. Tell the dentist when it happens, how long it lasts and whether it is changing.
Turn the science into useful questions
Which part of the tooth is affected? Is there a cavity, a crack, exposed root surface or another finding? What can prevention accomplish at this stage? Does the inner tissue need further assessment? How will we know whether the plan is working?
Explore related care
Fillings, root canal treatment and gum care address different problems. Reading about them cannot establish which treatment you need.
Is erosion the same as decay?
No. Decay involves acids produced by bacteria; erosion is tooth-surface loss from other acid exposure, such as acidic drinks or stomach acid. They can occur together and may need different prevention plans. Tell the dentist about frequent acidic drinks, reflux or vomiting rather than trying to identify the cause from tooth color alone. ADA: dental erosion.
Why does saliva matter?
Saliva helps clear food and supplies minerals that support teeth. Persistent dry mouth can raise decay risk and make eating or speaking uncomfortable. Medicines and health conditions are possible causes; dry mouth should not be dismissed as an inevitable part of aging. Discuss symptoms and your medicine list with your dentist or doctor, but do not stop a prescribed medicine yourself. NIDCR: dry mouth.
Three questions for your next checkup
- Are the changes you see caused by decay, erosion, wear or something else?
- Does my saliva, diet or health history change my prevention plan?
- Which change should I watch for, and when should we reassess?
Sources and review status
Prepared November 12, 2026. Practice and clinical review pending. ADA: tooth anatomy; NIDCR: tooth decay.
Temporary website review preview. General education only, not an individual diagnosis or treatment plan. Confirm current services with Fedon Family Dental.
Early mineral loss is not the same as a hole
Early decay may be stopped or reversed before a cavity forms. That does not mean a missing piece of tooth can grow back. A dentist needs to assess the stage and recommend care.