By Dave Burke A top Tory has been savagely mocked after telling MPs that a baby’s teeth start growing a year-and-a-half before birth. Former leadership contender Dame Andrea Leadsom made the bewildering remark during a Commons debate on the chronic shortage of NHS dentists. Health minister Dame Andrea told MPs: “I don’t know if they don’t know this, but actually you have teeth from before you’re born so if you don’t get your supervised toothbrushing until you’re three at a minimum, your teeth are about four-and-a-half years old.” Former frontbencher Jess Phillips quipped: “My youngest was born…