Composite filling have various advantages over conventional fillings. The composite fillings are best considered for cosmetic reasons as they are tooth colored and are preferred for the front teeth. However many people, who can afford them also get them done on back teeth as so to avoid the appearance of silver fillings on opening the mouth. The main advantages and disadvantes are discussed as under:

Dental Amalgam Vs Dental Composite Filling

Advantages of Composite Fillings

1. Small cavity cutting is done because the material can flow into small places
2. As less tooth cutting is done, this leaves your own tooth stronger. They integrate well with the tooth . 
3. Can be easily fixed if damaged.
4. Secondary decay is more easy to spot beneath tooth colored (composite ) filling.
5. They are temperature and electrical insulators and are resistant to extremes of hot and cold. 
6. More natural and attractive choice. 
7. They are more strong and durable. 
8. They bond to the tooth structure well and support the remaining tooth to help prevent breakage.  
9. More aesthetic than any other fillings(eg.amalgam fillings)

 DISADVANTAGES OF COMPOSITE FILLINGS

1.   They need proper isolation during bonding, especially during etching because if contaminated with saliva, whole process needs to be repeated again.
2. There is a potential to leak which can lead to secandary caries and this means your teeth needs a new filling.