Mechanical toothbrush - 1008335 Ontario Inc. Complete Patent Searching Database and Patent Data Analytics Services. The flexible seal 70 also has at least one second lip portion 76, each of which is in sealed engagement with a portion of each of the tuft blocks 40. The oscillating or back-and-forth motion of the distal ends 56 of the bristles is such as that which is indicated by the doubled-headed arrow 61 in FIG. 10.