I have a picky chinchilla and she has refused to chew other brands. She is almost 16 years old and her vet said her teeth are in excellent condition and that is because she chews her sticks nightly. Just opening the box you can smell that the sticks are fresh. Occasionally the sticks are 1/2 inch thick and those aren’t eaten as quickly as the smaller sticks which she prefers. Great product! -Pam from Potomac