How do you prevent tangles on curly hair?

My son has curly hair that she got from her father. It touches his shoulders and it a little layered. His hair looks puffy. He is 11 and doesn't care what it looks like. It gets tangled when he sleeps. I tried using detanglers but they don't work.How do you prevent tangles on curly hair?
i have curly hair too but i had allot of problem in my hair cuz it was curly and naw well i wash my hair only once in a week so provide tangle (and even the curly hair like to stay dry ) so when you take a bath combe it while you are putting water on it and shampoo and after getting out don't dry it with fuzzing it and let it a bit dry tell it gets dry by it own .How do you prevent tangles on curly hair?
Use a leave-in conditioner.



Here are some frizz tips for you!



* A good haircut is key (find an expert here: http://www.naturallycurly.com/curlsalons

* Sleep on a satin pillowcase

* Don't shampoo every day

* Comb conditioner through hair in the shower

* Avoid terrycloth towels; use microfiber instead

* Air dry or use a diffuser

* Use styling products suited for your hair type (http://www.naturallycurly.com/hair-types

* NEVER use a brush

* Don't touch your hair

* A pomade is great for mid-day touchups

* Apply styling products to dripping wet hair



Check out http://www.naturallycurly.com for lots of great info about curly, wavy, kinky and textured hair!
try Carols Daughter detanglers they work really well...or Motions