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Oral lichen planus (OLP) is a common mucocutaneous disease and is thought to affect 0.5-1% of the world's population. This condition can affect either the skin or mucosa or both. It cause bilateral white striations, papules or plaques on the buccal mucosa, tongue, and gingival. Erythema, erosions and blisters may or may not be present. The relative risk for oral lichen planus is highest among those who smokes and chewes tobacco. Aetiology:- It is T-cell mediated auto-immune disease ↓ cytotoxic CD8 + T-cell trigger apoptosis of epithelial cells ↓ recognition of antigen associated with  MHC  (Major Histocompatibility Complex) ↓ activation of CD8 + T-cell  ↓ trigger keratinocytes apoptosis ↓ activated CD8 + T-cell may release cytokines that attract additional lymphocytes into developing lesion. Clinical Features:- 1.) Affects female more (1.4:1). 2.) Probably occurs in older than 40 years. 3.) Skin lesion appears as s...

         The mucous extravasation cyst is the most common be benign lesion of the salivary glands, generally conceded to be traumatic origin, is a lesion involving salivary gland and their ducts. This lesion is characterized by pooling of mucous in a cavity within the connective tissue, due to the rupture of salivary duct or in or acini It is not a true cyst since it lack an epithelial lining.  Also known as:-     Mucus extravasation phenomenon   Mucus retention phenomenon Aetiology:- Biting the lips or cheek or pinching the lip by extraction forceps. Clinic Features:-     •  History of trauma (lip biting/pinching of lip)     •  Most frequently occure on lower lip.     •  Size in millimetres or few centimetres.     •  Dome shaped mucosal swelling.      •  Seen in children and young adults. ...

The term leukoplakia originates from two Greek words: Leuko means white & plakia means patch. Definition by WHO:  It is a whitish patch or plaque that cannot be characterized, clinically or pathologically, as any other disease and which is not associated with any other physical or chemical causative agent except the use of tobacco. Classification  •According to clinical description: Homogenous:  It is a completely whitish lesion. Flat: It has smooth surface. Corrugated: Like a beach at ebbing tide. Pumice-like: With a pattern of fine lines (cristae). Wrinkled: Like dry, cracked mud surface. Non-homogeneous  Nodular or speckled: Characterized by white specks or nodules on erythematous base. Verrucous: Slow growing, papillary proliferation above the mucosal surface that may be heavily keratinized. Extensive lesion of this type is known as oral florid papillomatosis. Ulcerated : Lesion exhibits red are...

 smoker's palate is a diffuse white patch on the hard palate, usually caused by tobacco smoking, usually pipe or cigar smoking.It is painless,and it is caused by a response of the palatal oral mucosa to chronic heat. A more pronounced appearance can occur with reverse smoking, sometimes distinguished from stomatitis nicotina by the term reverse smoker's keratosis. While stomatitis nicotina that is caused by heat is not a premaligant condition (i.e. it does not carry an increased risk of transformation to oral cancer), the condition that is caused by reverse smoking is premalignant.  The condition is uncommon.It occurs usually in elderly males who have a history of heavy pipe smoking, but it also can occur in cigar or cigarette smokers.The condition was once common, but has become more rare as habits such as pipe and cigar smoking have decreased in popularity. For more videos subscribe to EasyDent channel  link.:-  https://www.youtube.com/channel/UClIGeD2ekVf...

Tobacco pouch keratosis is also called snuff pouch, spit tobacco keratosis. Etiopathogenesis:-   Nicotine : The compound N-nitroso-nor-nicotine (NNN) , which is derived partly from bacterial action on nicotine during the curing process, is contributed but the action of salivary nitrites when  tobacco is held in the mouth. Clinical features:- Location:- It occurs in mucosal surface, where snuff is habitually held Gingiva and periodontal tissue : Painless loss of the gingival and periodontal tissue in the area of tobacco contact. Teeth :- Smokeless tobacco keratosis: It is white plaque present in the mucosa where chewing tobacco is kept. It is thin, gr or gray-white translucent lesion. Margin of the lesion blends gradually into the surrounding mucosa. The appearance of lesion depends upon hours of daily use and use of different tobacco leaves. Snuff pouch, tobacco pouch: Mucosa is soft, velvety touch feel on palpation and stretching of mucosa r...