The symptoms described — brief cold sensitivity lasting only 2–3 seconds with no lingering pain or spontaneous pain — are more consistent with a vital pulp with possible reversible pulpal inflammation, rather than established irreversible pulpitis. The discomfort on tight clenching may indicate periodontal ligament irritation/occlusal trauma and should also be evaluated. The radiograph appears to show a carious lesion, but its exact depth and pulpal involvement cannot be reliably determined from this photographed radiograph alone.
Next Steps
A clinical examination with cold pulp testing and/or EPT, percussion, palpation and occlusal evaluation is recommended. A properly exposed IOPA/bitewing should be taken to assess the depth of caries.
If the pulp responds normally and the pain to cold is brief/non-lingering, caries removal and a definitive restoration/deep caries management may be possible without RCT. If the caries is very deep, selective/stepwise caries removal or an appropriate pulp-protective approach may be considered depending on the clinical findings.
RCT should be considered only if clinical findings demonstrate irreversible pulpitis/necrotic pulp or other endodontic indications.
Health Tips
Do not decide between “deep filling” and RCT from the X-ray alone. The pulp-test response is particularly important here. Avoid repeatedly clenching or biting hard on the tooth until it is evaluated. If cold pain begins to linger, becomes spontaneous/night pain, or the tooth develops significant pain on biting, swelling or tenderness, seek dental evaluation promptly.