I highly recommend Cool and Clear Dental care. You just keep a capful in their water. you can use this along with what ever dental care you want to use. I personally just use this as mine will not let me brush their teeth.
I now sell it on my website
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My favorite testimonial is a 6 yr old yorkie had never had her teeth cleaned or brushed. Her teeth were covered in brown tartar. Her owner started using this and this only, and after 6 months the tartar was disappearing and it faded to a light brown stain. After 6 more months the stain was completely gone and her teeth were white.
I think since you just had their teeth done that this would be an AWESOME preventative for their teeth.