Teething accessories can be purchased. The rubbery ones and the liquid filled ones. This can freeze your baby or cause frostbite. Pain and teething medications should be used only the advice from your doctor or pediatrician. These dates are just a guideline.
Teeth can come in much earlier or later.
Teething time can be a family characteristic, or genetic. These dates are just a guideline. Teeth can fall out earlier or later. These little teeth need to be healthy for 6-12 years until the permanent teeth are in. This seems to be mostly a matter of opinion.