How long is a tooth cleaning if little plaque?

About one hour. On hour should not take more than that.
15-20 minutes. Dental cleaning and good oral hygiene is very important not only for your oral cavity, but studies clearly indicate that one remains healthier if keep teeth clean, limit the plaque, avoid periodontal disease or have it treated, regular brushing and flossing. The dental hygienist can go over this in detail with you, and will also give you guidelines as to frequency of check specific to you., .
40-60 min. First, the dental hygienist looks at your teeth, scales them, then cleaning, sometimes an x-ray is involved, tooth flossing, fluoride rinse and then the dentist comes to check your oral cavity and your teeth.