Protection Against Acid Erosion
How BioMin F toothpaste provides arguably the best protection against acid erosion
Biomin F toothpaste incorporates a 5% bioactive glass, which is able to slowly release calcium, phosphate, and fluoride ions to form acid-resistant fluorapatite for up to 12 hours after brushing. It is a major breakthrough for
oral care and is the result of over a decade of scientific research at Queen Mary University of London.
The very fine glass particles (5 microns average) adhere to the tooth surfaces – in a similar manner to the adhesion
of glass ionomers to tooth surfaces.
The encapsulation of fluoride in a bioglass of Biomin F is a completely different delivery system to traditional
soluble fluoride toothpastes and is not subject to salivary clearance. Studies at QMUL have also identified that
when salivary fluoride concentration is above 45ppm, calcium fluorite rather than fluorapatite is precipitated
Saliva slowly breaks down the glass structure releasing the three mineral ions. Because of this controlled manner
of fluoride release, it is possible to provide high level of protection to tooth surfaces using much lower levels
of fluoride than traditional toothpastes incorporating soluble fluoride; in most cases, the fluoride concentration
provided by traditional 1,450ppm fluoride toothpastes will halve every minute after brushing due to salivary
Novamin is the bioactive glass ingredient of Sensodyne Repair and Protect and delivers calcium and phosphate
forming a hydroxycarbonate apatite-like layer that is chemically similar to that present in enamel and dentine. This contains no fluoride in the glass and therefore requires the addition of a soluble fluoride in the formulation, which dissolves and is therapeutically ineffective after approximately 1.5 hours.
Protection and relief
Biomin F toothpaste mimics and enhances the way saliva replaces lost mineral on tooth surfaces, providing protection and relief from the effects of sensitivity, acid erosion and initial enamel decay.
The particles of Biomin F are also designed to be small enough to enter and occlude the dentinal tubules. Here
the saliva is able to slowly break down the glass matrix, releasing calcium, phosphate and fluoride ions that
combine together and precipitate on the tubule surfaces as fluorapatite.
Because of this controlled manner of fluoride release, it is possible to provide a high level of protection to tooth surfaces using much lower levels of fluoride than traditional toothpastes incorporating soluble fluoride.
Biomin F dissolves faster under acidic conditions and releases the mineral ions to help neutralise surface attack. Hence, when faced with an acid challenge, as a result of bacteria metabolising sugars or drinking an acidic beverage, the glass dissolves quickly releasing calcium, phosphate and fluoride ions to form fluorapatite crystals and also raise the pH.
Acid erosion is widely reported as an increasing oral health problem. A recently study from the University of Bern has shown that standard fluoride toothpastes are ineffective at combatting erosion and consequently they fail to meet the required criteria of oral care.
Other studies also show that fluorapatite is 10 times more resistant to acid attack than hydroxyapatite, so provides much longer protection and relief from the effects of sensitivity, enamel erosion and initial decay.