1 Let's bury daddy in the sand.
2 After we pass this area then we get into Khamer's border.
3 There are many curves along this road.
4 That dog runs very close into our lane.
5 After the dentist used the anesthetic injection, my gum got numb.
เล็กได้อันนี้มา เอาไปหมดเลยนะ
The first thing they'll (probably) do is place a topical gel in the area of where they'll be giving the anesthetic. This gel will numb the tissue so you won't feel the delivery/piercing of the anesthetic.
The dentist will then use an anesthetic (lidocaine, septocaine, etc) to numb the tooth. Believe me, the sight of the syringe and needle is MUCH MORE scary than actually getting the anesthetic itself. The Dr might jiggle your cheek as he gives it, to help take your mind off what's going on. If you need some extra help relaxing, try breathing in through your nose...deeply. The more relaxed you are, the better off you will be. :)
They will wait awhile before they start to work on you, and should wait until you are good and numb. If you don't feel you are numb enough, by all means...say something! Your dentist doesn't want you to feel discomfort at all.
When you are numb, the Dr will use a handpiece with a bur in it. Most people loveling refer to this instrument as "the drill". It makes a whistling noise and shoots out copious amounts of water...which is vital to getting the job done. This bur spins at 600 mph, and removes the decay/bacteria which is causing the cavity. The Dr will probably dry the area, perhaps place a liner/sensitivity materials, then place the filling.