Rat front tooth fell out

Hello, I adopted this boy, Simon, who was a rescue. He was rescued from this family who refused to touch him. Basically they had him and his brother in a cage that they refused to clean cuz they were afraid of catching diseases from them. Their rescuer told me the cage was just so horribly disgusting. Rat poop covering the whole floor. I have no idea what they fed them but I'm guessing not quality food. He is about 2 years old and spent a huge part of his life in neglected. His and his brother's teeth are white unlike my other rats. I'm guessing this is because they spent such a huge part of their life without any quality food? Anyway. When he first came home I checked his teeth, one of his upper teeth was a little shorter than the other and one of his bottom teeth was a little longer than the other. I just decided to keep an eye on it to make sure the bottom tooth didn't grow out of proportion. Today I checked his mouth and one of the upper teeth just isn't there anymore lol. Is this normal? Any idea of what may have caused this? Is it going to grow back? Thank you.

Thank you for taking in the two boys.
Some rats have white teeth - there are several reasons this can happen. I have been told that this can be genetic or an indication of health issues.
White teeth are brittle and can break or splinter

If the tooth bud is still present then the tooth will continue to grow.
Hopefully the tooth just broke off and the rest of the tooth is still there
A former member had a rat whose tooth grew back and everything was fine.
I had a girl whose tooth grew back but did not grow in the correct direction and was growing up through her skull - causing a great deal of pain. She had to be put to sleep by my vet.
Keep a close eye on him and watch for behavioural changes that could indicate pain.

Rat teeth: http://www.ratbehavior.org/Teeth.htm
http://ratguide.com/health/digestive/malocclusion.php
pain: http://ratguide.com/health/basics/signs_of_pain_in_rats.php

SQ said:

Thank you for taking in the two boys.
Some rats have white teeth - there are several reasons this can happen. I have been told that this can be genetic or an indication of health issues.
White teeth are brittle and can break or splinter

If the tooth bud is still present then the tooth will continue to grow.
Hopefully the tooth just broke off and the rest of the tooth is still there
A former member had a rat whose tooth grew back and everything was fine.
I had a girl whose tooth grew back but did not grow in the correct direction and was growing up through her skull - causing a great deal of pain. She had to be put to sleep by my vet.
Keep a close eye on him and watch for behavioural changes that could indicate pain.

Rat teeth: http://www.ratbehavior.org/Teeth.htm
http://ratguide.com/health/digestive/malocclusion.php
pain: http://ratguide.com/health/basics/signs_of_pain_in_rats.php

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Thank u so much for replying! And thank u for the links. He may need his teeth trimmed soon. We are seeing a vet asap. Just waiting for my vet to come back from a holiday.

When one of my rats lost an upper tooth, it grew back pretty quickly. Just keep an eye on it.

ViciousCurse said:

When one of my rats lost an upper tooth, it grew back pretty quickly. Just keep an eye on it.

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Thank u! It did grow back crazy fast