Unravelling the Enigma of Hidden Caries: Advances in Diagnosis and Management

Abstract— Hidden tooth decay, also known as occult caries, can be tricky to spot because it doesn’t always show obvious signs. This review breaks down how dentists find and treat these sneaky cavities. Instead of relying only on what they can see in the mouth, dentists often use special X-ray pictures to catch hidden decay early. These X-rays show things like dark spots or changes in the shape of the tooth that can signal trouble. When dentists do find hidden decay, they have different ways to fix it. Sometimes, it’s as simple as applying special treatments to help the tooth repair itself. Other times, more serious treatments like root canals might be needed. New technology, like fancy X-ray machines, is also making it easier for dentists to spot hidden decay. Overall, this review shows how important it is for dentists to keep an eye out for hidden tooth decay to keep smiles healthy. Keywords—Fluoride bomb, Occult caries, Hidden tooth decay, Hydroxyapatite, Lesion of enamel I. Introduction In tooth, enamel cracks may be caused by fluoride, this eventually leads to accumulation of microorganisms within the layer of enamel that is not diagnosed by dentist with a probe. The following leads to pit size carious lesion progressing into narrow depression of tooth which hides within ‘bombed-out tooth’ underneath it which is known in dentistry as a ‘fluoride bomb’ (1). Fluoride chronically causes increase in the hardness of the enamel layer (there may be a reduce in the enamel solubility in reciprocation to high acidic PH caused due to Noncalcified accumulation mainly of oral microorganisms and their products that adheres tenaciously to the teeth (2). This is due to the passage of both bacteria and saliva through the pits and fissures on the teeth surface which leads to decay within the yellowish portion of the tooth known as dentin which is present underlying enamel. As result the decay remains undetected for successive years and leads to what dentists relates to now as a ‘fluoride bomb’. The inner core of the tooth is at times completely destroyed and destructed, while the outer layer looks almost normal. In some cases it is a minor discolouration evidently seen along the enamel surface, but eventually in some cases the decay cannot be examined with a probe. Fluoride bombs concerns with progressive areas of teeth decayed in the sabbatical of cavities within tooth anatomy if fluoride rich enamel surface is emphasized on loop micro fissures will be seen in tooth anatomy, which ultimately propagates and in response “open the door” for cariogenic microorganism to enter the hydroxyapatite rich layer of teeth resulting in cavitation and decay within the dentin layer and enamel layer (3) II. History behind the issue In 1986 Hidden caries was firstly known as a dentinal lesion under the demineralized enamel. Dental caries is known as complete multifactorial disease and the most widespread chronic progressing disease. It is not enlisted within any of organized classification of disease. Also known as a disease, that includes cavitation of teeth produced from the microorganisms of oral cavity releasing end product of metabolism (3). Dental caries is made a unique form because of its pathological mechanism. As living standards improve, with increased intake of refined sugars, it eventually increases the incidence of caries in our society. There is difficulty in detection of occult lesions in their area of initiation. It is considered that occlusal caries may begin simultaneously in two surfaces, through minimal entrance into the enamel surface. The enamel surface is penetrated by cariogenic bacteria, but once it reaches the softer dentin their progression is gradually narrowed and restricted at times, meanwhile the fluoridated enamel undergoes remineralization, traces getting eventually covered. Near the entrance along the fissure, it involves the complete area superficially, where dietary substrates are fitted within the grooves and it ultimately starts progressing chronically. The fissure walls along the base involves the secondary caries, and hidden from direct view. Streptococci Mutans and lactobacillus acidophilus are mainly concerned with progression of occult lesions, which shows that lesions differ and not analogous with microorganisms of those found in carious structure of teeth, there is a complete entity named after pre-eruptive intracorneal resorbable lesions (4). Radiographic interpretation of some teeth is recorded with the report of occult caries in some studies. They gave the evidence of the radiolucency to be seen with analogous demineralised portion of the teeth. With the use of radiographs, it suggests that incidence of occult caries is detectable. Calcium along with phosphorus move from subsurface to superficial-surface with calcium and phosphate along with fluoride ions from the surface precipitate and eventually deposit into fissures which will ultimately occlude into the pores that will limit demineralisation of enamel surface above the subsurface of dentin and this led to intact of enamel surface and caries in subsurface level above dentin. It is considered that increase in fluid exposure leads to remineralisation of enamel and degrades the caries progression in small area and fissures of enamel cavity progress into dentin and becomes completely underneath the enamel surface. III. Challenged posed by the issue The finding outlay of cavitated lesions will pivot upon the pervasiveness of caries in the habitats. It is not easy to detect hidden dental caries in a monotonous examination with a mouth mirror and dental explorer. The appearance of the teeth can be normal looking with no cavities or holes seen. Even when a sharp explorer probes the teeth for cavities examination, the explore cannot probe into sticky pits or fissures (7). Caries nevertheless seen are hidden underneath below the naturally occurring grooves, pits, and fissures of teeth. Caries can also hide in the areas in interaction with the adjacent teeth and render them difficult to perceive visually and physically. Fluoride bomb leads the dentist to face challenges with prevention, diagnosis, treatment plan, patient education, oral prophylaxis. Bitewing radiographs is an important tool which helps in diagnosing hidden caries lesion, also in “caries-free” patients (10). Due to low diminution of radiation confined in the demineralized enamel layer, radiographic appearance of caries is a complete radiolucent whole area with 40% to 60% of tooth decalcified which requires introducing the radiographic appearance. It has been noticed that the incidence of hidden caries is chronically increasing because of regular use of fluoride, which reduces or marks the absence of demineralization representative of the carious lesion of enamel, hiding the caries progression into dentine surface (13). IV. Treatment The key to reducing the risk of tooth infection leading to extraction or root canal treatment lies in early detection. Dental caries can progress swiftly, underscoring the importance of regular check- ups every six months. By doing so, we can nip minor issues in the bud before they escalate into major concerns (1). Current approach to managing dental health is grounded in an individualized patient risk assessment, recognizing that each person possesses a unique set of factors that can influence their oral health. Caries Management through Risk Assessment (CAMBRA) is devised (4). When cavities breach the enamel, allowing bacteria to infiltrate the dentin, it becomes necessary to consider restoration through minimally invasive methods. In contrast to conventional approaches that address tooth damage only after it has significantly progressed, the current strategy focuses on prevention and management before cavities develop. Effective CAMBRA (caries management by risk assessment) management primarily hinges with progression of disease and the extent of tooth decay. CAMBRA advocates for use of chemical agents to promote remineralization in early precavitated lesions, as well as the sealing of non- cavitated occlusal lesions. It supports invasive restorative techniques when they are necessary for treatment of occult caries(20). V. Treatment protocols Silver Diamine Fluorides is used in Pediatrics patients it exhibits inhibition in caries advancement but showcases black spots over the tooth surface and this is aesthetically not acceptable so as a foremost alternative fluoride is used (19). White spot lesion area are seen when fixed orthodontic appliances create stagnation areas of plaque and makes tooth cleansing difficult to inhibit the incidence sodium fluoride rinsing in recommended. VI. Summary of Theory Hidden caries alludes with carious structure of teeth, that occurs from inefficient diagnosis by the operator, and it may occur due to pre-operative and post-operative processes. The existence of an intracorneal resorptive defect that occurs before eruption may cause occult caries, The prevalence and diagnosis of occult caries depends on the operator’s efficiency and adequacy. Initial diagnosis of fluoride bomb lesions is the best way of managing it. Radiographs are the most commonly used for diagnosis of occult caries. Radiographs provide accurate diagnosis and are convenient. Occult caries, a term used to describe dental lesions that arise due to insufficient clinical diagnosis, can originate from both pre-eruptive and post-eruptive processes. Pre-eruptive intracorneal resorptive defects may exist before tooth eruption and are often associated with many occult lesions. Once the teeth have erupted, it becomes challenging to distinguish pre-eruptive lesions from those caused by genuine fissure caries.