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Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

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Related Experiment Video

Updated: Jan 25, 2026

Visualization of the Charcoal Agar Resazurin Assay for Semi-quantitative, Medium-throughput Enumeration of Mycobacteria

Visualization of the Charcoal Agar Resazurin Assay for Semi-quantitative, Medium-throughput Enumeration of Mycobacteria

Published on: December 14, 2016

Charcoal-containing dentifrices.

Linda H Greenwall¹, Joseph Greenwall-Cohen², Nairn H F Wilson³

¹Specialist Practitioner, Private Practice, Hampstead, London, UK.

British Dental Journal

|May 12, 2019

Summary

This summary is machine-generated.

Charcoal toothpastes offer extrinsic stain removal and tooth whitening effects. However, scientific evidence supporting these popular oral hygiene products is currently limited, requiring further investigation.

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Area of Science:

Oral hygiene
Cosmetic dentistry
Material science

Background:

Charcoal toothpastes and powders are increasingly popular global oral hygiene products.
These products are marketed for toothbrushing, extrinsic stain removal, and tooth whitening.
Dental professionals frequently receive patient inquiries regarding their efficacy and safety.

Purpose of the Study:

To provide a comprehensive overview of current knowledge on charcoal toothpastes and powders.
To evaluate the scientific evidence supporting manufacturers' claims for these products.

Main Methods:

Literature review of existing studies and manufacturer claims.
Analysis of available scientific data on charcoal's oral health properties.

Main Results:

The popularity of charcoal toothpastes is rising globally, with widespread production reported.
Patient inquiries to dental teams about charcoal products are common, often met with empirical advice.
The evidence base supporting the claimed benefits of charcoal toothpastes and powders is currently weak.

Conclusions:

Further research is needed to validate the efficacy and safety of charcoal toothpastes.
Dental professionals require evidence-based guidance to advise patients on charcoal oral hygiene products.