Tooth enamel

Tooth enamel is the highly mineralized outer layer of teeth, serving as the primary physical barrier protecting underlying dentin and pulp from mechanical, chemical, and microbial injury[1][5][8]. In addition, immediately after cleaning, a protein-rich film known as the salivary pellicle forms rapidly on the enamel surface and further protects teeth by acting as a transient physical barrier against acids and bacteria[2]. Artificial barriers such as dental sealants—resin-based coatings applied to grooves of teeth—provide preventive protection by sealing susceptible areas and physically blocking bacterial and acidic challenges[3][4][6][7]. While these structures and materials act as "physical barriers" on tooth surfaces, the term does not correspond to a distinct molecular target, receptor, or druggable entity in biomedical databases.\n\nNote:\n- The phrase "Physical barrier on tooth surface" is a functional/structural description, not a canonical molecular target or receptor.\n- Enamel is a tissue composed mainly of hydroxyapatite crystals with structural proteins; the salivary pellicle is a protein biofilm; and "sealant" is a synthetic polymer barrier[1][5][2][3]. None are considered classic therapeutic molecular targets.\n- If your application requires a true molecular or protein target, refer to "Amelogenin," "Enamelin," or specific components of the acquired pellicle instead[5].

Other names

Tooth surface barrierEnamel barrierSalivary pellicleDental sealant

Physical protection: Acts as a barrier to microbial invasion and acid diffusion\nRemineralization: Incorporation of minerals like fluoride can help strengthen enamel or sealant barriers\nPassive insulation: Reduces sensitivity to temperature/chemical stimuli