Signs, Symptoms, and Causes of Tooth Decay - Appearance of a chalky white spot on the tooth surface - Brown discoloration indicating demineralization - Formation of a cavitation (cavity) - Softening of affected areas of the tooth - Exposed dentinal tubules leading to pain and sensitivity - Presence of tooth surface (enamel or dentin) - Caries-causing bacteria, such as Streptococcus mutans and Lactobacillus species - Fermentable carbohydrates (sucrose, fructose, glucose) - Time for the disease process to occur - Sheltered environment promoting development of cariogenic biofilm

Bacteria and Complications of Tooth Decay - Mutans streptococci, particularly Streptococcus mutans and Streptococcus sobrinus - Lactobacilli - Cariogenic bacteria present in dental plaque - Shift in bacterial balance due to sugar intake or inadequate biofilm removal - Role of Streptococcus mutans in biofilm formation and acid production - Inflammation of tissue around the tooth - Tooth loss - Infection or abscess formation - Bad breath and foul tastes - Spread of infection to surrounding soft tissues, leading to life-threatening complications

Prevalence, Prevention, and Socio-economic Factors of Tooth Decay - Approximately 3.6 billion people (48% of the population) have dental caries in their permanent teeth - Nearly all adults experience dental caries at some point - Dental caries affect about 620 million people (9% of the population) in baby teeth - More common in developed countries due to higher sugar consumption - Prevention includes regular teeth cleaning, low-sugar diet, and fluoride use - Poverty is a significant social determinant for oral health - Dental caries are linked to lower socio-economic status - Dental caries can be considered a disease of poverty - Intrauterine and neonatal lead exposure promote tooth decay - Exposure to certain ions, such as cadmium, may promote tooth decay

Factors Affecting Tooth Decay - Dietary sugars: Bacteria in the mouth convert glucose, fructose, and sucrose into acids through fermentation. - Exposure: The frequency of exposure to acidic environments affects the likelihood of caries development. - Teeth: Certain diseases and disorders can increase the risk of cavities. - Other factors: Reduced salivary flow rate, medications, medical conditions, radiation therapy, altered metabolism, tobacco use, and exposure to secondhand smoke increase the risk of caries.

Pathophysiology and Classification of Tooth Decay - Pathophysiology: Microbe communities attach to tooth surface and create a biofilm, leading to acid production and demineralization. - Enamel: Bacteria produce lactic acid, causing demineralization of enamel crystals. - Dentin: Dentin reacts to the progression of dental caries, with odontoblasts producing dentin and defense mechanisms including sclerotic and tertiary dentin. - Cementum: Cemental caries increases in older adults with gingival recession and can result in tooth loss. - Classification of Caries: G. V. Black Classification of Restorations categorizes caries by location, etiology, rate of progression, and affected hard tissues. Early Childhood Caries is a specific type affecting young children. Rate of progression can be acute, chronic, recurrent, incipient, or arrested. Caries can involve enamel, dentin, or cementum.