Tooth Decay Stages, Cavity Diagnosis and Filling Material Costs in Gurugram

Neo Smile Dental Clinic · Gurugram · Updated 2026-09-04

A small dark spot on a tooth or sudden sensitivity to cold water is often the first sign of tooth decay. Many patients at our clinic in Sector 9A, Gurugram, come in once they notice a cavity or a nagging toothache, wanting to understand how bad it is and what a filling might cost. This article walks you through how decay progresses, how dentists diagnose it, and how the common filling materials compare.

How Tooth Decay Develops in Stages

Tooth decay does not happen overnight. It moves through fairly predictable stages, and catching it early usually means simpler, less costly treatment.

1. Early enamel demineralisation: Acid from bacteria and sugar weakens the outer enamel. You may see a white or chalky patch. No pain yet.
2. Enamel decay: The surface breaks down further and a small cavity may form in the enamel. Still often painless.
3. Dentin decay: Once decay reaches the softer dentin layer beneath the enamel, it spreads faster. This is when sensitivity to sweets, hot or cold food usually begins.
4. Pulp involvement: If untreated, decay reaches the nerve and blood vessels inside the tooth (the pulp), causing noticeable pain, and often needing a root canal rather than a simple filling.
5. Abscess formation: In advanced cases, infection can spread beyond the root tip, leading to swelling, throbbing pain, and sometimes fever.

Filling a cavity at the enamel or early dentin stage is usually simpler and more comfortable than treating decay that has reached the pulp.

How Cavities Are Diagnosed

Dentists use a combination of methods to confirm decay and judge how deep it goes.

• Visual examination: Checking for discoloration, roughness, or visible holes using a dental mirror and light.
• Dental probe: A blunt instrument gently checks if the tooth surface feels soft or sticky, a sign of active decay.
• X-rays: These reveal decay between teeth or under old fillings that is not visible to the eye, and show how close the decay is to the nerve.
• Sensitivity testing: Checking response to cold or air helps assess whether the nerve is affected.

Once the extent of decay is known, your dentist will recommend either a filling, an inlay, or a root canal, depending on how deep the damage is.

Comparing Filling Materials

If a simple filling is enough, you generally have three material choices. Each has its own strengths.

Composite (Tooth-Coloured) Fillings

Made of a resin blended with fine particles, composite fillings are matched to your natural tooth shade, making them popular for front teeth and visible areas. They bond directly to tooth structure, which can mean less drilling in some cases. They may wear slightly faster than amalgam in large back-tooth fillings that bear heavy chewing force.

Amalgam (Silver) Fillings

A mix of metals including silver, tin, and mercury, amalgam has been used for decades because it is strong and long-lasting, especially for molars that do heavy chewing. The main drawback is the silver colour, which is visible when you open your mouth, and some patients simply prefer a tooth-coloured option.

Glass Ionomer Fillings

This material releases fluoride, which can offer some extra protection against further decay, and it bonds chemically to tooth structure. It is often used for fillings near the gum line, in baby teeth, or as a base layer under other materials. It tends to be less durable under heavy biting pressure compared to composite or amalgam.

These are typical ranges only. Actual pricing depends on the size and depth of the cavity, the number of surfaces involved, and whether any additional treatment like a base layer or local anaesthesia is needed. Your dentist will confirm the exact cost after an examination and X-ray.

Choosing the Right Filling for You

There is no single best material for everyone. A front tooth cavity usually calls for composite because of appearance, while a large molar cavity might do better with amalgam for strength, or composite if you prefer a natural look and are willing for a slightly higher cost. Glass ionomer is often chosen for children or as a protective, fluoride-releasing option near the gums.

If you have noticed a cavity, sensitivity, or a toothache, it is worth getting it checked before the decay progresses to a deeper stage. Early treatment is generally simpler and more affordable than waiting until the pain becomes severe.

Treatment costs mentioned on this page are indicative ranges for the Gurugram region. Your exact cost depends on your case and will be confirmed after a clinical examination at the clinic.