Everyone has their own ideas of what is safe, so you'll get varied opinions here and will make your own decisions based on your research. I consider rawhide dangerous and will not give it to my dogs. Your dogs are small right? So yes the Greenies can be dangerous for them, but probably not more than the rawhide. I'd say brush their teeth or give them a raw meaty bone once a week. Chicken back, or turkey necks or beef necks will do a good job keeping tarter away. Two of my dogs are on raw diets, so their teeth are gorgeous. My older dog is on EVO, so I do brush his teeth and also wipe his mouth out with Novaldent (Chlorhexidine) once a day as well.

I don't need to worry about cleaning teeth. Even though my dogs eat kibble most of the time (Ultra Lamb and Rice), they get, at a minimum, one raw turkey drumstick each on the weekends. Some weeks they are lucky and I buy them turkey thighs, also. They have beautiful teeth. Works for cats, too (with chicken parts). Back when I got my older dog he was 2 or 3 years old and his teeth were COVERED with tartar. There was hardly any white showing. If he chewed on something, his teeth would even bleed. That night I got him (Saturday) I started feeding him raw chicken parts. By the time his Monday vet appointment came around, his teeth were looking so much better that the vet didn't hardly comment on them. He just said that if they get any worse that they WOULD need cleaning in the future. Well, after two weeks you'd never know they were so terrible in the beginning. I really think that this was a worst case scenario when I got him and he really turned around.

A lot of bad info in recent comments... "Speed oven is a type of microwave." No. A speed oven is not at a microwave of any sort. Speed ovens are often combined with a microwave but the speed oven is totally different technology, usually light. Combi Speed/MW have an advantage in being able to use both technologies to produce food that is enjoyable to eat and retains nutritional value. "Microwaves give off radiation, destroys nutrients in food." No. From a purely nutritional standpoint cooking in a microwave is extremely good and preserves nutrients better than most forms of cooking. There are dozens or hundreds of studies on this that you can find online. That said, I don't like the taste and texture of microwaved food. For veggies steaming is nearly equally as good as microwave from a nutritional standpoint but produces more enjoyable food to eat. I also love to roast veggies but roasting does reduce the nutritional value significantly more than steam or MW. ---- From an overall health standpoint, ANY harm from a microwave (and we still don't know if there is or not) is likely far less than that from traditional cooking (induction, gas or electric coil) with a poor range exhaust hood that results in VOC's and Carcinogens spread throughout your house.

I have a Chihuahua who is not happy at all about getting her teeth brushed.... sweetest Chihuahua I've ever owned yet gives me a snarl over brushing her teeth. I bought a baby toothbrush at Walmart and the doggie toothpaste at Pets Mart. I get a few of her teeth brushed pretty good and other's... forget it. I also bought some Arm and Hammer drops at Pets Mart, you just put a drop or two in their mouth and it's supposed to help keep their teeth clean. It has an Enzyme in it that is suppose to help break down any tartar on their teeth.