Composite resin is commonly used for the following dental procedures:

1. Dental Fillings: Composite fillings are used to repair cavities (dental caries). They are a popular alternative to traditional amalgam (silver) fillings because they can be color-matched to the patient's natural tooth shade, making them less noticeable.

2. Dental Bonding: Dental bonding involves applying composite resin to the surface of a tooth to repair minor imperfections, such as chips, cracks, or discolorations. It is a minimally invasive and cost-effective cosmetic procedure.

3. Veneers: Composite veneers are thin shells of composite resin that are custom-made and bonded to the front surfaces of teeth to improve their appearance. They can be used to enhance the shape, size, and color of teeth.

4. Dental Crown Repair: Composite resin can be used to repair or build up a damaged dental crown, making it look and function like new.

5. Gap Closure: Composite resin can be used to close small gaps or spaces between teeth, providing a more uniform smile.

6. Tooth Sculpting: Dentists can use composite resin to reshape and contour teeth, creating a more aesthetically pleasing and balanced appearance.

One of the advantages of composite resin is its ability to mimic the natural appearance of teeth. Dentists can precisely shade and shape the material to match the patient's existing teeth, making it a popular choice for cosmetic dentistry procedures. Additionally, composite resin bonds well to tooth structure and requires less removal of healthy tooth material compared to amalgam fillings, which is beneficial for preserving tooth structure.

However, composite resin may not be as durable as some other dental materials, such as dental ceramics or metals, and it can be more prone to staining or wear over time. The longevity of composite restorations can vary depending on the location in the mouth and the patient's oral hygiene practices.

The longevity of composite resin fillings can vary depending on several factors, including the size and location of the filling, your oral hygiene practices, and your overall dental health. On average, composite resin fillings can last anywhere from 5 to 15 years or more. Here are some factors that can influence the lifespan of composite resin fillings:

1. Size of the Filling: Smaller fillings tend to last longer than larger ones. Large fillings are more prone to wear and stress, which can lead to cracks and failures over time.

2. Location in the Mouth: Fillings in areas that experience a lot of chewing and biting forces, such as molars, may wear down faster than fillings in less-stressful areas.

3. Oral Hygiene: Good oral hygiene practices, including regular brushing, flossing, and dental check-ups, can help extend the life of composite resin fillings by preventing decay and gum disease.

4. Diet: A diet high in sugary and acidic foods can contribute to the breakdown of fillings and the development of new cavities.

5. Teeth Grinding (Bruxism): Individuals who grind their teeth may experience more wear and tear on their fillings, potentially reducing their lifespan.

6. Dental Care and Materials Used: The skill of the dentist placing the filling and the quality of the materials used can also impact the longevity of composite resin fillings.

7. Overall Dental Health: The presence of other dental issues, such as gum disease or tooth decay, can affect the lifespan of fillings.

It's important to note that composite resin fillings are generally considered less durable than amalgam (silver) fillings, which may last longer but are more noticeable in the mouth. However, many patients prefer composite resin fillings because they can be colour-matched to the natural teeth, providing a more aesthetically pleasing option.