Cosmetic dentistry can be more expensive than general dentistry. The additional cost factor is that cosmetic dentists care about the appearance of your smile, which means they are more likely to choose more expensive materials.
Take the example of tooth decay. General and cosmetic dentists have the expertise to remove cavities and fill cavities. Cosmetic dentists tend to favor composite fillings that are designed to match your existing tooth color to look more natural. However, composite fillings tend to be more expensive.
On the other hand, your general dentist may recommend filling the cavity with a more affordable material such as amalgam.