does eating tobacco cause cancer Frontiers Smoking causes 92% of oral

Evidence Required to be in Po Page 13 and 14: -9-4

doi: 10.1186/s12889-021-10810-z 12

What to Keep in Mind While over-the-counter whitening products offer flexibility, they have limitations: Best for mild stains on the outer enamel May require weeks of regular use to see results Less effective on deep or long-term discoloration To boost effectiveness, combine them with proper brushing, flossing, and regular dental cleanings

Factors that affect how long nicotine stays in your system The following factors affect how long nicotine stays in the system: Frequency and amount of nicotine use: Regular users retain nicotine and its metabolites in their system longer than those who use it occasionally