Caries: How to treat and preserve teeth

Today, caries treatment is based on the principle of minimally invasive treatment: the dentist's goal isn't simply to fill a hole, but to stop the disease, preserve the tooth's vitality, and avoid traumatic interventions for as long as possible. To achieve this, the dentist first assesses the activity of the process, the depth of the lesion, and the risk factors, and then selects a treatment strategy—from remineralizing therapy and sealants to gentle preparation with highly adhesive materials. This approach allows the tooth to regain its function and aesthetics without sacrificing healthy tissue.

Early foci of demineralization can often be stabilized without a drill using systemic and topical fluoride prophylaxis, sealants, and resin infiltration. When a cavity forms and self-cleaning of the surface becomes impossible, restoration of the anatomy with a filling is indicated, strictly adhering to the adhesive protocol. In key areas near the pulp, biological protection methods are used to preserve the vital pulp and avoid endodontic treatment.

The decision on the method is always individualized: age, hygiene, frequency of free sugar consumption, dry mouth, orthodontic appliances, and general medical conditions are taken into account. Managing the patient's behavior and habits is an important part of the treatment plan. Without dietary adjustments and regular interdental cleaning, any perfect filling will quickly become surrounded by new lesions.

Modern dentistry views caries treatment as a journey, not a one-time procedure. It begins with diagnosis and motivation, continues with non-invasive and restorative measures, and is reinforced by preventative measures with regular checkups. This approach yields the best long-term results: fewer complications, fewer repeat procedures, and more natural teeth preserved.

Treatment goals and when to start

The main goal of caries treatment is to stop the disease, preserve vital tooth tissue, and restore function and aesthetics with minimal invasion. The modern paradigm initially attempts to stop early lesions without drilling, and then moves on to preparation and fillings when the defect is no longer capable of remineralization or there is a cavity that collects plaque and debris. This approach reduces the risk of complications and prolongs the life of the tooth. [1]

Treatment should begin when signs of active demineralization or a cavity has formed. Non-cavitational white or brown spots on smooth surfaces and in fissures can often be remineralized without a bur, with increased fluoride prophylaxis and hygiene. Cavitations require restoration to restore self-cleaning and plaque control. [2]

The dentist makes the decision after a clinical examination, assessment of the lesion activity, and imaging as indicated. Not only the depth of the lesion is important, but also the patient's behavior, sugar intake, and access to fluoride prophylaxis. Risk factor management goes hand in hand with treatment; otherwise, relapse is inevitable. [3]

Modern guidelines have systematized the choice of tactics by lesion type and age. Clinical recommendations for non-invasive and restorative treatment have been published for primary and permanent teeth, including materials and the extent of carious tissue removal. Following these recommendations increases the predictability of outcomes. [4]

Non-restorative methods for early lesions

The basic tool is fluoride. Twice-daily application of sodium fluoride toothpaste at a concentration of approximately 1000-1500 ppm reduces the risk and helps remineralize initial lesions. In-office use of 5 percent fluoride varnish every 3-6 months or other professional applications as indicated. This is the foundation of non-invasive management. [5]

Silver diamine fluoride, at a concentration of 38 percent, is capable of stopping caries in primary teeth and exposed roots, as proven in studies and reviews. It is easy to use and inexpensive, but it leaves a permanent black stain on the affected area, making it more commonly used in pediatrics, geriatrics, and patients at high risk for caries. Repeated applications are recommended for a lasting effect. [6]

Icon resin infiltration is indicated for interdental and smooth surfaces with non-cavitating lesions. This method seals porous enamel and blocks acid diffusion, slowing or stopping the lesion without preparation. Combination with fluoride varnish enhances results in some patients. [7]

Fissure sealants and prophylactic fillings are used on chewing surfaces in early lesions. They create a physical barrier against plaque and other debris. If a full-fledged sealant is not possible, at a minimum, local fluoride treatments are enhanced and interdental hygiene is monitored. [8]

Table 1. Non-invasive options and where they are strong

Method	Where does it work best?	Key limitations
Fluoride varnish 5 percent	Smooth surfaces, fissures, root	Regular applications are required
Silver diamine fluoride 38 percent	Milk teeth, root surfaces	Black color of the hearth
Resin infiltration	Interdental non-cavitational lesions	Requires isolation and experience
Fissure sealing	Chewing surfaces of molars	Not for deep cavitation

Minimally invasive restoration of cavities

Once a cavity has formed, the goal is to restore anatomy and seal while preserving as much healthy tissue as possible. For moderate to deep lesions, selective caries removal down to the soft or hard dentin at the base is recommended, avoiding pulp exposure. This reduces the risk of complications and increases restoration survival. [9]

Stepwise treatment, where soft dentin is left behind and then returned to after a period of time, is inferior to selective removal according to current data and is used less frequently. The key to success is reliable isolation, an adhesive protocol, and precise restoration of contact points and occlusion. [10]

On chewing surfaces with limited defects, partial incremental techniques using composite or hybrid glass ionomers in high-humidity conditions are effective. For larger defects and cracks, indirect restorations are considered, but minimal preparation is maintained whenever possible. [11]

In areas close to the pulp, biological protection methods are used—calcium-containing or bioceramic liners, and for truly deep lesions, indirect pulp capping followed by a sealed adhesive restoration. The goal is to preserve vitality and avoid endodontic treatment. [12]

Table 2. Volume of removal for medium and deep caries

Situation	Recommended approach	Target
Medium depth, no pulp symptoms	Selective removal to hard dentin at the periphery	Sealing and adhesion
Close to the pulp, the pulp is vital	Selective removal to the soft bottom, pulp protection	Maintain viability
Risk of pulp exposure	Biological pads, careful isolation	Reduce the inflammatory response

Selection of filling material and adhesive protocol

Composites are the standard for aesthetic restorations and small occlusal defects due to their strength and color match. Success depends on moisture control, etching and adhesive, layering, and proper polymerization. Overheating and shrinkage stress are minimized by appropriate layer thicknesses and adaptive techniques. [13]

Glass ionomer cements are suitable for difficult isolation, in the root zone, and in patients with high risk of injury, as they release fluoride and chemically bond with tissue. Rubber-filled hybrids offer better wear resistance in the cervical region. If necessary, "sandwich" techniques with composite are possible. [14]

Amalgam is gradually becoming less common in some healthcare systems due to environmental and aesthetic concerns, despite its high durability. For large cavities with a risk of cracking, indirect ceramic or composite restorations are considered, maintaining the principle of minimal invasion. [15]

The choice of material is no substitute for disease control. Without reducing free sugar intake and increasing fluoride prophylaxis, even ideal fillings will not protect against new lesions on other surfaces. The material is only part of the plan. [16]

Special clinical situations

Root caries in elderly patients is treated with a combination of fluoride and minimally invasive restorations. Silver diamine fluoride may be the first line of treatment for active root lesions, especially in patients with polymorbidity and limited mobility, with informed consent due to darkening of the lesion. [17]

In children, methods that preserve vitality and accommodate the child's cooperation are preferred. Fluoride varnish and silver diamine fluoride are effective for early lesions, while atraumatic restorative techniques with glass ionomer and selective extraction are effective for cavitation. This increases success and reduces the need for anesthesia. [18]

For multiple lesions in high-risk adults, treatment is block-based. First, the disease is stabilized with non-invasive measures and temporary sealed restorations, followed by permanent fillings. Diet and hygiene are adjusted simultaneously. [19]

In patients with limited access to dentists, school-based and community-based programs have shown that silver diamine fluoride is as effective as sealants in prevention and arrest in some scenarios. This does not replace the role of sealants and fluoride, but rather expands the public health toolkit. [20]

What happens during a visit and how is pain controlled?

Anesthesia is selected individually, taking into account the location and extent of the procedure. With minimally invasive techniques, superficial anesthesia or infiltration is often sufficient. Pain control continues with a short course of nonsteroidal anti-inflammatory drugs, as indicated. [21]

Standard restoration steps include field isolation, cleaning and preparation of enamel and dentin, adhesive protocol, layered material placement, and finishing with polishing. Proper matrix and wedges are critical for interproximal contacts, otherwise the risk of secondary caries increases. [22]

For deep lesions, biological methods for maintaining vitality are possible, including indirect pulp capping and sealed restoration. The patient is warned about possible temporary sensitivity and is scheduled for follow-up. Early treatment when pain increases allows for timely initiation of pulp therapy. [23]

The appointment concludes with instructions on hygiene and diet for the coming days, a follow-up appointment, and, in high-risk cases, a plan for professional fluoride varnishes and preventative visits every 3-6 months. This is part of the treatment, not an option. [24]

Table 3. Stages of caries treatment in the office

Stage	What does a doctor do?	For what
Diagnostics and plan	Examination, targeted imaging as indicated	Choice of non-invasive or restorative tactics
Insulation	Cofferdam or alternative	Dry field for adhesion and safety
Preparation and restoration	Selective removal, adhesive, material	Sealing and shape restoration
Control and prevention	Instructions, fluoride varnish, appointment schedule	Reducing the risk of relapse

Mistakes, complications and how to avoid them

Common mistakes include premature drilling where fluoride and infiltration could have stopped the lesion, or, conversely, delaying cavitation filling. Both strategies increase the risk of pulpitis and secondary caries. A balance is achieved by following clinical recommendations and controlling risk factors. [25]

Secondary caries is more often associated with poor sealing and hygiene than with "poor material." Proper occlusion, smooth polishing of margins, and regular interdental cleaning reduce the likelihood of recurrence. If the risk is high, scheduled professional fluoride applications are prescribed. [26]

Aesthetic concerns may arise after silver diamine fluoride treatment due to darkening of the lesion. This is an expected effect of caries arrest, which can be compensated for by restoration in the smile zone once the patient is ready for invasive treatment. Discussing expectations before beginning therapy is critical. [27]

Post-treatment pain is usually short-lived. Increased pain, nighttime attacks, or biting pain after a few days require a follow-up examination to rule out pulpitis or occlusion issues. Early contact with the doctor prevents complications. [28]

After treatment - how to maintain the results

Reducing free sugar intake to less than 10 percent of daily energy, and preferably to 5 percent, reduces the risk of new lesions. This includes controlling snacks, sugary drinks, and sticky sweets. This same recommendation is useful for preventing other noncommunicable diseases. [29]

Brush your teeth twice a day with fluoride toothpaste and use interdental cleaners. If risk is high, your dentist will prescribe fluoride varnish every 3-6 months and prescribe additional fluoride products for home use. Habits are more important than one-time "super-treatments." [30]

Follow-up visits allow for early detection of new lesions and their treatment without drilling. Photographic documentation and a short risk scale help patients monitor progress and maintain motivation. This saves tissue and money in the long run. [31]

If there are areas of gum recession, dry mouth, or orthodontic appliances, the dentist will tailor the preventative plan. Root surfaces require special fluoride treatment, and hygiene techniques are tailored to specific clinical conditions. [32]

Table 4. Home plan after treatment

Action	Frequency	Target
Brushing with fluoride toothpaste	2 times a day	Remineralization and plaque control
Interdental cleaning	Daily	Reducing the risk of interdental lesions
Limiting free sugars	Constantly	Fewer acid attacks
Preventative visit and fluoride varnish	Every 3-6 months according to risk	Early interception of relapses

Brief conclusion

Today, caries treatment encompasses a spectrum of solutions, from purely preventative and non-invasive to minimally invasive restorations. Proper management begins with assessing the activity of the lesions, fluoride prophylaxis, and sugar management, with drilling and fillings only being considered when they are unavoidable. Following modern clinical guidelines and controlling risk factors helps preserve pulp vitality, minimize the need for intervention, and prolong the life of the tooth. [33]