Gingival discolouration A. Bismuth in blood - Blue-black colour B. Mercury in blood - black C. Lead in blood – red / reddish blue.5. PAIN ● Within 48 hours ➔ Deep cavity ー patients come with sensitivity to hot and cold food. ➔ Pulp exposed. ➔ Class 2 cases ー pulpal horns exposure. ● Supra occlusion / High point / Defective Occlusion ➔ Within 1 week. ➔ TOP +ve ➔ Sensitivity to hot and cold food ーdue to detachment of CEJ from gums ー thus exposing dentin ∴ Sensitivity. ● If only sensitivity ➔ Dentine cause and not high point

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