X0306 4 2019-06-03 0 0000811240 BIOLASE, INC BIOL 0001743526 Norbe Todd 4 CROMWELL IRVINE CA 92618 1 1 0 0 President and CEO Common Stock 2019-06-03 4 F 0 4446 1.52 D 34533 D Common Stock 2019-06-04 4 F 0 948 1.60 D 33585 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.30 to $1.71, inclusive. The reporting person undertakes to provide to Biolase, Inc., any security holder of Biolase, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4. /s/ Michael C. Carroll attorney-in-fact for Todd Norbe 2019-06-05