How Much Caries Do We Really Need to Remove? ADA Chairside Guide Puts Selective Caries Removal in Focus

For vital permanent teeth requiring restoration, the ADA guide favours selective carious tissue removal over more aggressive approaches in most moderate and advanced lesions. But what does that actually mean when the bur is in your hand?

For years, one of the most familiar principles in restorative dentistry was simple: remove the decay until you reach hard dentine.

The problem is that deep carious lesions do not always give the clinician much room for error. The closer the lesion gets to the pulp, the greater the price of aggressive excavation can become.

The American Dental Association’s chairside guide on restorative treatment of caries lesions takes a more conservative approach. For vital, non-endodontically treated permanent teeth requiring restoration, the guideline prioritises selective carious tissue removal for both moderate and advanced lesions.

The important part is understanding what the guideline means by “selective.”

Selective does not mean leaving caries everywhere.

The ADA defines selective carious tissue removal as removing carious tissue until soft or firm dentine is reached, rather than continuing until hard dentine is encountered everywhere. Non-selective removal, by comparison, means removing carious tissue until hard dentine is reached.

That distinction becomes particularly relevant in deeper lesions.

For moderate caries lesions, defined in the guide as ICDAS 3 and 4, selective removal is prioritised over non-selective removal when a restoration is required.

For advanced lesions, ICDAS 5 and 6, the recommendation goes further: selective removal is prioritised over both stepwise caries removal and non-selective removal.

In other words, the recommendation is not simply “remove less.”

It is remove carious tissue selectively, preserve tooth structure and avoid unnecessary excavation—while still creating a restoration that can be successfully placed and maintained.

What about stepwise excavation?

This is an important distinction at the chairside.

Stepwise carious tissue removal involves removing caries to soft dentine initially, placing a temporary restoration, and then returning months later to remove the remaining carious tissue to firm dentine before placing the definitive restoration.

The ADA guide does not prioritise this approach over selective removal for advanced lesions.

Instead, selective removal is ranked ahead of stepwise and non-selective removal.

That is a clinically important shift for dentists who still routinely plan a second excavation simply because deep caries was left over the pulpal aspect.