Tooth and Mouth Problems

Hi, my son is 18 months old. He has around 10 teeths. What I need is, when to start brushing his teeth. What to use, I mean which tooth paste and which tooth brush. Is there any special procedure and precautions to follow? Please help on this matter. Thanks in advance .

Since last 5-7 days I have lots of dryness in my mouth. It subsides momentarily with water but keeps coming back. Especially at night. Also, there's a very foul and bitter taste. I feel like eating to nullify the bad taste, and while the food is in the mouth it's fine but immediately after the bad taste kicks in. I have just finished a 7 day course of antibiotics (augmentin 625 and linox) for a bacterial infection on my skin. Also taking unicontin and montair for my asthma for last 1 month. Regularly on inhalers. Is it because of excessive medicines. What can I do ?

Day before yesterday my mother had a pain in above tooth It cause a swelling. Doctor has given amoxicillin and pain relief medicine but its not coming down

I have been noticing lately that my jaws are not align. I am not able to bite properly and there is constant pain in front of right ear.

Since last 7-10 days I'm having recurring tooth ache. Taken a few pain killers but not feeling well.

I want to align my teeth. But don't know much  about the braces and there is a large category of braces suggested by Orthodontist to me. I am totally confused right now.

Extreme pain and sweeling as wisdom tooth is coming(Down right). Due to this, I'm not able to eat. The whole area is swelled up which is causing fever and headache.

My tooth are very broad and longer and it looks very weard whenever I smile. I want my tooth in best shape so that my smile becomes lovable

I've have been a toothache and heavy pain for past six hours so please give suggestions for useful for me

Taking antibiotics since last 2 days. No improvement. Have to take divon plus every 5 hrs to kill severe pain.