The mostly recommended age by the dentist worldwide is by age of 1 or within six months after the first tooth erupts. Milk teeth usually begin growing in around 6 months of age.
A pedodontist is a dentist who is specialized in treating the children, infants, adolescents from age 0-12 yrs. They are different in a way that after BDS they continued their education with several years of additional specialised training in the field of pediatric dentistry. The pedodontist has an extensive knowledge and experience in dealing and treating with children.
Yes baby teeth aren’t permanent but they play an important role in their development. While the baby teeth are in place, these teeth help your little one to speak, smile and chew properly. Most importantly they are holding the space for the permanent teeth in their jaw. So if the teeth are lost early maybe due to decay or damage the nearby tooth can shift to that place which will surely result in crooked or misaligned permanent teeth. And also the general health of a child is very much affected by their oral health.
There has always been a large majority of children who suck their thumbs or fingers as little kids but they mostly grow out of it after reaching certain age. It doesn't do any permanent damage to their teeth but if they continue sucking after permanent teeth have erupted, let your dentist know so they can check and see if the habit may cause any problem in future.
Once the child starts to have a few teeth you can try using the toothpaste placing it on a soft-bristled baby toothbrush or finger brush. Only a tiny amount should be used for cleaning. For children of age 3 years or less use paste about a size of rice grain. For children of 3-6 yrs use paste about a size of PEA. Always be sure to choose toothpaste that is non-flouride in nature as children usually tend to eat the toothpaste or try to swallow it while brushing and too much fluoride can cause teeth to stain. You should brush your child’s teeth until they are ready to brush properly on their own that is maybe by 6-7 years of age of age.