A new study to look at the different ways tooth decay in children is treated is to be launched.

Among the UK-wide research team, is Richard Welbury, Professor of Paediatric Dentistry at the Glasgow University Dental School.

The £2.87 million study has been commissioned by the National Institute for Health Research Health Technology Assessment (NIHR HTA) programme and will be led by experts of Dundee University.

Over 40% of children in the UK already experience obvious decay in their baby teeth by the time they are five years old. This means that dental decay is one of the most common childhood diseases.

Only 12% of decayed baby teeth in five year olds are treated with fillings, while the vast majority are left untreated.

The most common reason for children to receive out-patient general anaesthetic is to have teeth removed.

Dr Gail Topping, Dr Nicola Innes and Dr Jan Clarkson, all from the University of Dundee will lead experts from universities in Cardiff, Dundee, Leeds, London, Newcastle and Sheffield.

Mr Welbury said in a statement: "We will be assessing the benefits of three different methods for treating tooth decay in baby teeth with cavities.

"These are: conventional fillings biological treatment of the decay, that is sealing the decay into teeth with filling materials or under crowns, generally without the need to use injections or dental drills and using only preventive techniques such as better tooth brushing, less sugar in a child's diet, application of high fluoride varnish and fissure sealants to stop the decay.

He added: "We will also investigate what children think of the different types of treatments."

The study will include children aged three to seven who already have decay in their teeth but no toothache or abscesses.