Tobacco remains one of the major risk factors for a number of chronic diseases, including cancer, lung and cardiovascular diseases
If you see signs of periodontal disease (including red, swollen, bleeding, or receding gums) or experience bad breath, painful chewing, or loose teeth, make sure to contact your dentist immediately
Like other examples of protein staining, the mechanism is complicated and poorly understood, but the basic outline is that parts of keratin are greasy (the non-polar amino acids) that associate with other greasy things
They may indicate mold or bacteria build-up, potentially causing respiratory issues, allergies, or headaches
Stores that do not comply could be convicted of a criminal offence or receive a fixed penalty fine from trading standards officers