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They lose their milk teeth during childhood.
Humans generally have two sets of teeth: deciduous (baby) teeth and permanent teeth. Most people lose their first set of teeth between the ages of about 6 to 12. These teeth are replaced by the permanent teeth. If you lose a baby tooth after 13 or any age, it will be replaced by a permanent tooth. If you lose a permanent tooth, it won't be replaced- although if you have the tooth and can get to a dentist very quickly, they can sometimes be saved. Teeth don't ever "grow back".
Most dogs will lose their teeth in old age. Younger dogs will lose teeth due to poor dental hygiene, trauma or some diseases.
Most dogs start to lose their baby teeth around 5 months of age.
You won't get them unless all of your baby teeth are gone. Most people get them after that because they don't want to wait 80 years until all of their teeth are gone again.
Most commonly all 20 milk/baby teeth. However some people lose less and they fall when they are much older which people mistaken as third generation teeth
Most baby teeth don't have roots at all, because they will come out. If they have roots they are probably adult teeth.
The first molars that children get are called "pre-molars" and they come through at around 24 months of age. They are baby teeth and will eventually fall out to be replaced by adult teeth. The first 'adult' molars come through at around 6years of age, the next lot at about 12yrs & the last lot (if they make it past the gum line) are the wisdom teeth which come between the ages of 17 - 21 generally. For a 3D model & a good stage by stage description please refer to the related link.
Around 4 to 5 months of age, puppies will start to lose their "baby teeth" and their permanent teeth begin to grow in. Puppies lose their teeth in a specific order: first the smaller front teeth come out, then the premolars, molars and finally the canine teeth come out. Most of the time teeth fall out while eating/playing/etc so they are often swallowed.
If it is a young horse, they will lose baby teeth at about 2-3 years of age and the adult teeth will replace them. If it is an old horse, the teeth are much looser and the gums are not as strong, so an aging horse may start to lose teeth at anywhere from 15-30 years of age. In this case, a change of diet needs to be made. Feed your senior horse softer foods and grains that do not need a lot of chewing.Young horses will start to shed the milk teeth between 1 and 2 and usually by 4 they have most of their adult teeth.
Most common is 20.
I would wait one more week then I would take him/her to the vet