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