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Table 2 Prevalence of tooth discolouration in smokers and non-smokers

From: Smoking and tooth discolouration: findings from a national cross-sectional study

Tooth discolouration Non-smokers N (%) Smokers N (%)
Normal 1236 (51.8%) 379 (45.8%)
Mild 774 (32.4%) 224 (27.1%)
Moderate 275 (11.5%) 149 (18.0%)
Severe 102 (4.3%) 76 (9.2%)