Lol noob. Just level up Enchanting and Illusion. Enchant some Converse™ with Fortify Illusion and then supplement that with the Apple a Day perk. You should be able to convince any dentist that you've already had your operation after that.
@Dark child Didn't you read the changes made during the last patch? the Apple a Day perk was nerfed, since now it falls under the influence of Acidic Erosion, giving a +2 to all acid damage and a +1 to all poison damage received. You'll end up making the dentist's attacks overpowered, pushing them into double damage.
Your best bet would be to level Agility and Intelligence attributes for that sweet Swift Evasion perk, giving you a 50% chance to avoid all damage from the first attack. But even that's a gamble.