Grinding or bruxism wears the teeth, and leaves marks on them depending on the severity and the time. Erosion is normally caused by another issue, such as gastric reflux disease, but to the untrained eye, the effects may appear similar.
First, the first molars come in back of the mouth, the far end of all of the baby teeth. Lower first, normally about six months later, the upper. Around the age of 6.
Later, and speed of which they come in is governed by genetics, not that chart you see that is not even a good average the two front in the lower, followed by the upper about six months later. Then, the next in line is the two lower front teeth offset to the side of the center ones. Then, the uppers in the same location, again six months later. Then, the third tooth from the center in the lower, followed by the upper. There might be some variation from this order, as sometimes the fourth tooth will come in rather than the third. Normally, lower then upper.
It is important to realize that if all the baby teeth are lined up nicely, without any gaps between them, crowding is a natural consequence, as the secondary teeth are invariably larger than the primary teeth. Crowding and displacement from the normal alignment can be caused by not only a lack of space, but by extra teeth, which sometimes occur, by displacement of teeth outside of their normal spots, and their running into other teeth, forcing them into wrong positions. All that is probably best checked out by someone who knows what is going on. A children's dentist, or an orthodontist.
My daughter is 4 years old and is used to sucking her thumb. Will it cause her teeth to grow outwards?
So, bottom line, the thumb needs to be out of there asap.
I have recently got my braces fixed and they seem to be cutting into the skin of my mouth. What to do?
Is there a lack of space? Was this caused by a baby tooth being too slow to be lost? Is this tooth fitting improperly with the opposite jaw teeth? Is there too much space, is there something in the gums against the root of the crooked tooth?
All of these and more are possible problems which cause the tooth to be misaligned. So, the answer is never as simple as it would seem and needs further analysis before a definitive answer. Once the real reason for the tooth being in the wrong place is answered, then the course of alignment is much easier to decide.