A stitch in time – before cracked tooth syndrome becomes pulpitis
Avoiding irreversible pulpal damage
What makes CTS particularly significant from an endodontic perspective is its potential to cause irreversible pulpal damage – and the speed at which that transition can occur1.
Cracks can compromise pulp health
The pulp is protected by an intact layer of enamel and dentine. When a crack propagates through the dentine, this barrier is disrupted. Dentinal tubules exposed along the crack line allow bacterial ingress and fluid movement directly towards the pulp, triggering an inflammatory response.
Initially, this produces reversible pulpitis – characterised by sharp, transient sensitivity to thermal stimuli and biting pressure2. At this stage, if the crack is identified and stabilised, pulp vitality can often be preserved.
However, if the crack persists, the inflammatory process will progress. Chronic bacterial irritation and the stress of occlusal load can drive the pulpitis from reversible to irreversible. Left untreated, pulp necrosis and apical periodontitis are likely to follow3.
The diagnostic challenge
The symptoms of CTS do not align necessarily with standard diagnosis criteria of the pulp. Patients typically report pain on biting with relief on release4 , and variable thermal sensitivity. These presentations can mimic periodontal pathology, occlusal dysfunction, or referred pain from adjacent teeth, making accurate diagnosis slightly more time-consuming.
Vitality testing, selective bite testing, transillumination, and periodontal probing are all valuable diagnostic tools here5. CBCT can assist in assessing crack depth and periapical status, particularly in molar teeth where anatomy can complicate the assessment.
Crucially, conventional periapical radiographs are unreliable for crack detection. A tooth can show no radiographic abnormality despite significant crack propagation and established pulpitis.
Pulpal and periapical sequelae
When irreversible pulpitis is confirmed in a cracked tooth, root canal treatment is likely required. The endodontic complexity of these cases, however, is frequently underestimated.
Cracks can extend into the pulp chamber floor or along the root, compromising the seal achievable during obturation. In molar teeth, crack propagation may follow a more unpredictable path. Operating microscope examination during access can reveal crack lines, identify their extent, and inform decisions about tooth restorability before treatment is committed to.
Where a vertical root fracture is identified – often presenting with a narrow, isolated periodontal probing defect alongside periapical pathology – the prognosis is poor regardless of endodontic intervention, and extraction is typically the next step.
When to refer
Specialist assessment is appropriate when CTS is suspected but cannot be confirmed clinically, when pulpal diagnosis is unclear, or when root canal treatment is indicated in a tooth with a known or suspected crack propagation. Specialist endodontists routinely assess crack extent under magnification, provide CBCT-supported diagnosis where needed, and advise on restorability prior to committing to treatment – all of which informs a more accurate patient communication and planning phase.
Early referral, before irreversible pulpal change is established, offers the best chance of preserving both the tooth and its long-term prognosis.
1 Mathew S, Thangavel B, Mathew CA, Kailasam S, Kumaravadivel K, Das A. Diagnosis of cracked tooth syndrome. J Pharm Bioallied Sci. 2012;4(Suppl 2):S242-S244. doi:10.4103/0975-7406.100219
2 Seet RF, Chan PY, Khoo ST, Yu VSH, Lui JN. Characteristics of Cracked Teeth with Reversible Pulpitis After Orthodontic Banding-A Prospective Cohort Study. J Endod. 2022;48(12):1476-1485.e1. doi:10.1016/j.joen.2022.09.002
3 Yang SE, Jo AR, Lee HJ, Kim SY. Analysis of the characteristics of cracked teeth and evaluation of pulp status according to periodontal probing depth. BMC Oral Health. 2017;17(1):135. Published 2017 Nov 28. doi:10.1186/s12903-017-0434-x
4 John K, Pepper T. Cracked Tooth Syndrome. [Updated 2024 May 7]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/sites/books/NBK606115/
5 Yu M, Li J, Liu S, Xie Z, Liu J, Liu Y. Diagnosis of cracked tooth: Clinical status and research progress. Jpn Dent Sci Rev. 2022;58:357-364. doi:10.1016/j.jdsr.2022.11.002