Researchers have found that many teething powders and gels contain ‘potentially harmful ingredients’ including the drug lidocaine and alcohol.

A new study found that of 14 products examined, two contained sucrose, six contained alcohol and six contain lidocaine, an anaesthetic used to numb tissue.

Nigel Monaghan, from Public Health Wales, publishing in the British Dental Journal, said there is little evidence that the products are actually effective in reducing teething pain.

The British Dental Association (BDA) backed his view, urging parents to be alert to the ingredients in teething products.

The study comes after the Medicines and Healthcare products Regulatory Agency (MHRA) announced in December that teething products with lidocaine would no longer be sold in supermarkets and high street shops and would only be found in pharmacies.

The medicines regulator conducted a review that found products with lidocaine were linked with a ‘very small’ risk of harm and there was little evidence they work.

Parents should use teething rings or massage gums

It recommends that parents should massage the gums or use a teething ring, instead of using the gels.

The latest study looked at 14 products, including Anbesol, Dentinox, Calgel, Bonjela Junior and Boots own brand.

It concluded:  ‘Despite a lack of evidence of effectiveness for teething products, of the 14 licensed products in the UK, nine contain one or more of sucrose, alcohol or lidocaine.

‘There is an opportunity to develop new guidance to steer health professionals and the public away from these potentially harmful products.’

The BDA said the products containing sugar increased the risk of tooth decay.

Meanwhile, exposure to alcohol may lead to poor sleep, while lidocaine was a risk in high doses.

BDA chairman Mick Armstrong said: ‘Parents buying teething powders to save infants from distress won’t always realise they’re offering their kids sugars, alcohol or lidocaine.

‘Buying a licensed product should offer confidence you’re making a safe choice.

‘The reality is consumers are navigating a minefield of potentially harmful ingredients.

He called for ‘real change in the way these products are licensed and marketed, and clear guidance so parents understand the risks.’

The MHRA said none of the products it licenses contain sucrose and alcohol had a function to prevent products spoiling and was at very low levels.