A new analysis of published data shows that, although there is considerable variation between products, they do work – at least in the short term. The data also showed that some products can cause mild to moderate tooth sensitivity and cause irritation of the gums.
The Authors of this Cochrane systematic Review note that amidst more than 400 articles that looked at teeth whitening agents, only 25 met their inclusion criteria. All looked at the effect after using the whitener for two weeks, but only 13 studies reported outcome data one week after this two-week application period. Of these, only 6 reported outcome data after one month or longer.
“People should be aware that there is no available long term data on the effect or safety of these products,” says lead author Dr Hana Hasson.
The Review Authors also noted that all of the trials were either sponsored or carried out by the manufacturers of the products.
“There is an urgent need for independent long-term studies evaluating the effectiveness and harms associated with home teeth-whitening products,” says Hasson.
Polly Young | alfa
The cytoskeleton of neurons has been found to be involved in Alzheimer's disease
18.01.2019 | University of the Basque Country
Bioinspired nanoscale drug delivery method developed by WSU, PNNL researchers
10.01.2019 | Washington State University
The scientific and political community alike stress the importance of German Antarctic research
Joint Press Release from the BMBF and AWI
The Antarctic is a frigid continent south of the Antarctic Circle, where researchers are the only inhabitants. Despite the hostile conditions, here the Alfred...
World first experiments on sensor that may revolutionise everything from medical devices to unmanned vehicles
The new sensor - capable of detecting vibrations of living cells - may revolutionise everything from medical devices to unmanned vehicles.
Dead and alive at the same time? Researchers at the Max Planck Institute of Quantum Optics have implemented Erwin Schrödinger’s paradoxical gedanken experiment employing an entangled atom-light state.
In 1935 Erwin Schrödinger formulated a thought experiment designed to capture the paradoxical nature of quantum physics. The crucial element of this gedanken...
Cellulose obtained from wood has amazing material properties. Empa researchers are now equipping the biodegradable material with additional functionalities to produce implants for cartilage diseases using 3D printing.
It all starts with an ear. Empa researcher Michael Hausmann removes the object shaped like a human ear from the 3D printer and explains:
The phenomenon of so-called superlubricity is known, but so far the explanation at the atomic level has been missing: for example, how does extremely low friction occur in bearings? Researchers from the Fraunhofer Institutes IWM and IWS jointly deciphered a universal mechanism of superlubricity for certain diamond-like carbon layers in combination with organic lubricants. Based on this knowledge, it is now possible to formulate design rules for supra lubricating layer-lubricant combinations. The results are presented in an article in Nature Communications, volume 10.
One of the most important prerequisites for sustainable and environmentally friendly mobility is minimizing friction. Research and industry have been dedicated...
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