Composite Filling (Resin Treatment)

What Is a Composite Filling?

A composite filling is a tooth-coloured resin material I use to repair teeth that have been damaged by decay, chips, or cracks. Unlike the silver amalgam fillings you may remember from years past, composite resin is carefully matched to the shade of your natural teeth, making the repair virtually invisible. It's the most common restorative procedure I carry out in my Carlow practice, and one of the most satisfying — because the results look and feel completely natural.

The composite material bonds directly to your tooth structure, which means I can often preserve more of your natural tooth compared to amalgam fillings. It's a conservative, effective, and aesthetically pleasing way to restore your tooth to full health and function.

When Do You Need a Composite Filling?

I may recommend a composite filling in several situations:

• Small to medium cavities — when decay has created a hole in the tooth that needs to be filled to prevent further damage
• Chipped or cracked teeth — composite can rebuild the shape of a tooth that's been damaged by injury or wear
• Worn teeth — teeth that have been worn down by grinding (bruxism) or acid erosion can be built back up
• Cosmetic improvements — closing small gaps between teeth, reshaping uneven teeth, or improving the appearance of discoloured teeth
• Replacing old amalgam fillings — many patients choose to replace their silver fillings with tooth-coloured composite for aesthetic reasons, or when the old filling has deteriorated

What to Expect During the Procedure

The process is straightforward and typically completed in a single appointment:

1. Numbing — I'll apply a local anaesthetic to ensure you're comfortable throughout. You shouldn't feel any pain during the procedure.
2. Removing decay — using a small dental drill, I carefully remove the decayed portion of the tooth, preserving as much healthy tooth structure as possible.
3. Preparing the surface — the cavity is cleaned and treated with a bonding agent that helps the composite adhere securely to your tooth.
4. Placing the composite — I apply the resin in thin layers, carefully building up the filling to restore the tooth's natural shape.
5. Curing each layer — a special blue light is used to harden each layer of composite. This takes just a few seconds per layer.
6. Shaping and polishing — once the filling is built up, I shape it to match the contours of your tooth and polish it smooth. I'll check your bite to make sure everything feels natural.

The entire process usually takes between 30 and 60 minutes per tooth, depending on the size and location of the filling.

Advantages of Composite Fillings

• Natural appearance — matched to your tooth colour, so the filling blends in seamlessly
• Bonding strength — composite bonds directly to the tooth, providing structural support
• Conservative preparation — less healthy tooth structure needs to be removed compared to amalgam
• Versatile — can be used for repairs, reshaping, and cosmetic improvements
• Mercury-free — for patients who prefer to avoid amalgam materials

How Long Do Composite Fillings Last?

With proper care, a composite filling typically lasts 7–10 years, and many last considerably longer. Their longevity depends on factors such as the size of the filling, where it is in the mouth, your diet, and your oral hygiene habits. Back teeth that bear heavy chewing forces may see more wear over time than front teeth.

I'll keep an eye on all your fillings during routine check-ups and let you know if any are showing signs of wear or deterioration before they become a problem.

Learn More

For detailed guidance on looking after your new filling, read my aftercare guide for composite fillings. Taking the right steps in the first 24 hours and maintaining good habits afterwards will help your filling last as long as possible.

If you think you might need a filling, or if you'd like to discuss replacing old amalgam fillings with composite, feel free to get in touch with my practice to arrange a consultation.