Conservative MP David Davies controversially claimed that 14 teenagers who entered the United Kingdom from Calais "don't look like children".
Moreover, the dentists disputed claims that dental radiographs can accurately determine whether someone is under the age of 18 or not.
France is demanding that Britain take in more of the hundreds of unaccompanied minors seeking to reach relatives across the Channel before the camp is shut down.
His comments came as 14 unaccompanied teenagers who had been living in the Calais "Jungle" were reunited with relatives after being transferred to Britain on Monday, ahead of the demolition of the French migrant camp.
Doctors of the World said he should face disciplinary action for making the remarks after claiming that 14 teenage asylum-seekers who arrived in Britain on Monday "don't look like children". "We don't want to vilify anyone... but if we don't raise these questions we are not going to be able to help the people who need our help".
But the BDA, which represents dentists and dental students in the United Kingdom, disputed claims that dental radiographs can accurately determine whether someone is under the age of 18 or not.
One source with knowledge of the situation said photographs were misleading and they have "never doubted" any of the migrants' ages.
Mr Davies said the United Kingdom "should not be naive" about refugees pretending to be younger than they are in order to enter the UK.
The Home Office has said it works closely with French authorities to establish whether any children are eligible to come to the United Kingdom before they arrive. However Citizens UK said it was thought that the picture was that of a translator who was accompanying the children.
He added: "Such is the seriousness of Mr Davies's unethical and divisive remarks that we are asking his party chairman to consider disciplinary action".
Under EU asylum law, child refugees are allowed into the United Kingdom if they have family already living here.
It's after the first unaccompanied children were brought into the United Kingdom earlier this week (below).
Monmouth MP David Davies said mandatory teeth checks would reassure people but the British Dental Association said it was unethical.
French presidential hopeful Alain Juppe said that he would push to move the border with Britain from Calais to southern England, a sign of the increasing pressure facing London after the Brexit vote, the Guardian newspaper reported on Friday.
"Officials made a judgment, we have to accept that judgment, but if there is a case for dental checks, I would certainly not as home secretary have ruled that out", he said.
The MP's suggestion for dental checks has been rejected by professional bodies, the government, and refugee advocacy groups.
The Government has pledged to resettle 3,000 refugee children.
French President Francois Hollande announced last month that the camp will close before winter, with its inhabitants dispersed around the country.