According to the NHS Confederation, 1,700 girls aged 13 to 14 around the country have had contraceptive implants and 800 others have received injections with the same effect, without their parents' knowledge.

The claim is that it has helped to reduce teenage pregnancy levels, which are now at their lowest since the early 1980s.

Conservative MP Nadine Dorries and Simon Blake, chief executive of the Brook Advisory Centre, debate the issue.

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